READ EVEYTHING BEFORE YOU USE ANY METHOD LISTED BELOW

Basic BIOS password crack - works 9.9 times out of ten
This is a password hack but it clears de BIOS such that de next time you start de PC, de CMOS does not ask for any password. Now if you are able to brin’ de DOS prompt up, den you will be able to change de BIOS settin’ to de default. To clear de CMOS do de followin’:
Get DOS prompt and type:

DEBUG hit enter
-o 70 2e hit enter
-o 71 ff hit enter
-q hit enter
exit hit enter

Restart de computer. It works on most versions of de AWARD BIOS.

Accessin’ information on de hard disk
When you turn on de host machine, enter de CMOS setup menu (usually you have to press F2, or DEL, or CTRL+ALT+S durin’ de boot sequence) and go to STANDARD CMOS SETUP, and set de channel to which you have put de hard disk as TYPE=Auto, MODE=AUTO, den SAVE & EXIT SETUP. Now you have access to de hard disk.

Standard BIOS backdoor passwords
The first, less invasive, attempt to bypass a BIOS password is to try on of dese standard manufacturer’s backdoor passwords:

AWARD BIOS
AWARD SW, AWARD_SW, Award SW, AWARD PW, _award, awkward, J64, j256, j262, j332, j322, 01322222, 589589, 589721, 595595, 598598, HLT, SER, SKY_FOX, aLLy, aLLY, Condo, CONCAT, TTPTHA, aPAf, HLT, KDD, ZBAAACA, ZAAADA, ZJAAADC, djonet

AMI BIOS
AMI, A.M.I., AMI SW, AMI_SW, BIOS, PASSWORD, HEWITT RAND, Oder

Oder passwords you may try (for AMI/AWARD or oder BIOSes)
LKWPETER, lkwpeter, BIOSTAR, biostar, BIOSSTAR, biosstar, ALFAROME, Syxz, Wodj

Note that de key associated to “_” in de US keyboard corresponds to “?” in some European keyboards (such as Italian and German ones), so — for example — you should type AWARD_SW when usin’ those keyboards. Also remember that passwords are Case Sensitive. The last two passwords in de AWARD BIOS list are in Russian.

Flashin’ BIOS via software
If you have access to de computer when it’s turned on, you could try one of those programs that remove de password from de BIOS, by invalidatin’ its memory. However, it might happen you don’t have one of those programs when you have access to de computer, so you’d better learn how to do manually what dey do. You can reset de BIOS to its default values usin’ de MS-DOS tool DEBUG (type DEBUG at de command prompt. You’d better do it in pure MS-DOS mode, not from a MS-DOS shell window in Windows). Once you are in de debug environment enter de followin’ commands:

AMI/AWARD BIOS
O 70 17
O 71 17
Q

PHOENIX BIOS
O 70 FF
O 71 17
Q

GENERIC
Invalidates CMOS RAM.
Should work on all AT moderboards
(XT moderboards don’t have CMOS)
O 70 2E
O 71 FF
Q
Note that de first letter is a “O” not de number “0″. The numbers which follow are two bytes in hex format.

Flashin’ BIOS via hardware
If you can’t access de computer when it’s on, and de standard backdoor passwords didn’t work, you’ll have to flash de BIOS via hardware. Please read de important notes at de end of this section before to try any of dese methods.

Usin’ de jumpers
The canonical way to flash de BIOS via hardware is to plug, unplug, or switch a jumper on de moderboard (for “switchin’ a jumper” I mean that you find a jumper that joins de central pin and a side pin of a group of three pins, you should den unplug de jumper and den plug it to de central pin and to de pin on de opposite side, so if de jumper is normally on position 1-2, you have to put it on position 2-3, or vice versa). This jumper is not always located near to de BIOS, but could be anywhere on de moderboard. To find de correct jumper you should read de moderboard’s manual. Once you’ve located de correct jumper, switch it (or plug or unplug it, dependin’ from what de manual says) while de computer is turned OFF. Wait a couple of seconds den put de jumper back to its original position. In some moderboards it may happen that de computer will automatically turn itself on, after flashin’ de BIOS. In this case, turn it off, and put de jumper back to its original position, den turn it on again. Oder moderboards require you turn de computer on for a few seconds to flash de BIOS. If you don’t have de moderboard’s manual, you’ll have to “brute force” it… tryin’ out all de jumpers. In this case, try first de isolated ones (not in a group), de ones near to de BIOS, and de ones you can switch (as I explained before). If all them fail, try all de oders. However, you must modify de status of only one jumper per attempt, oderwise you could damage de moderboard (since you don’t know what de jumper you modified is actually meant for). If de password request screen still appear, try anoder one. If after flashin’ de BIOS, de computer won’t boot when you turn it on, turn it off, and wait some seconds before to retry.

Removin’ de battery
If you can’t find de jumper to flash de BIOS or if such jumper doesn’t exist, you can remove de battery that keeps de BIOS memory alive. It’s a button-size battery somewhere on de moderboard (on elder computers de battery could be a small, typically blue, cylinder soldered to de moderboard, but usually has a jumper on its side to disconnect it, oderwise you’ll have to unsolder it and den solder it back). Take it away for 15-30 minutes or more, den put it back and de data contained into de BIOS memory should be volatilized. I’d suggest you to remove it for about one hour to be sure, because if you put it back when de data aren’t erased yet you’ll have to wait more time, as you’ve never removed it. If at first it doesn’t work, try to remove de battery overnight.

Important note: in laptop and notebooks you don’t have to remove de computer’s power batteries (which would be useless), but you should open your computer and remove de CMOS battery from de moderboard.

Short-circuitin’ de chip
Anoder way to clear de CMOS RAM is to reset it by short circuitin’ two pins of de BIOS chip for a few seconds. You can do that with a small piece of electric wire or with a bent paper clip. Always make sure that de computer is turned OFF before to try this operation.

Here is a list of EPROM chips that are commonly used in de BIOS industry. You may find similar chips with different names if dey are compatible chips made by anoder brand. If you find de BIOS chip you are workin’ on matches with one of de followin’ you can try to short-circuit de appropriate pins. Be careful, because this operation may damage de chip.

CHIPS P82C206 (square)
Short togeder pins 12 and 32 (de first and de last pins on de bottom edge of de chip) or pins 74 and 75 (de two pins on de upper left corner).
gnd
74
|__________________
5v 75–| |
| |
| |
| CHIPS |
1 * | |
| P82C206 |
| |
| |
|___________________|
| |
| gnd | 5v
12 32

OPTi F82C206 (rectan’ular)
Short togeder pins 3 and 26 (third pin from left side and fifth pin from right side on de bottom edge).
80 51
|______________|
81 -| |- 50
| |
| |
| OPTi |
| |
| F82C206 |
| |
100-|________________|-31
|| | |
1 || | | 30
3 26

Dallas DS1287, DS1287A
Benchmarq bp3287MT, bq3287AMT
The Dallas DS1287, DS1287A and Benchmarq bp3287MT, bq3287AMT chips have a built-in battery. This battery should last up to ten years. Any moderboard usin’ dese chips should not have an additional battery (this means you can’t flash de BIOS by removin’ a battery). When de battery fails, de RTC chip would be replaced. CMOS RAM can be cleared on de 1287A and 3287AMT chips by shortin’ pins 12 and 21. The 1287 (and 3287MT) differ from de 1287A in that de CMOS RAM can’t be cleared. If dere is a problem such as a forgotten password, de chip must be replaced. (In this case it is recommended to replace de 1287 with a 1287A). Also de Dallas 12887 and 12887A are similar but contain twice as much CMOS RAM storage.
__________
1 -| * U |- 24 5v
2 -| |- 23
3 -| |- 22
4 -| |- 21 RCL (RAM Clear)
5 -| |- 20
6 -| |- 19
7 -| |- 18
8 -| |- 17
9 -| |- 16
10 -| |- 15
11 -| |- 14
gnd 12 -|__________|- 13

NOTE: Although dese are 24-pin chips, de Dallas chips may be missin’ 5 pins, dese are unused pins. Most chips have unused pins, though usually dey are still present.

Dallas DS12885S
Benchmarq bq3258S
Hitachi HD146818AP
Samsun’ KS82C6818A
This is a rectan’ular 24-pin DIP chip, usually in a socket. The number on de chip should end in 6818. Although this chip is pin-compatible with de Dallas 1287/1287A, dere is no built-in battery. Short togeder pins 12 and 24.
5v
24 20 13
|___________|____________________|
| |
| DALLAS |
|> |
| DS12885S |
| |
|__________________________________|
| |
1 12
gnd

Motorola MC146818AP
Short pins 12 and 24. These are de pins on diagonally opposite corners - lower left and upper right. You might also try pins 12 and 20.
__________
1 -| * U |- 24 5v
2 -| |- 23
3 -| |- 22
4 -| |- 21
5 -| |- 20
6 -| |- 19
7 -| |- 18
8 -| |- 17
9 -| |- 16
10 -| |- 15
11 -| |- 14
gnd 12 -|__________|- 13

Replacin’ de chip
If nothin’ works, you could replace de existin’ BIOS chip with a new one you can buy from your specialized electronic shop or your computer supplier. It’s a quick operation if de chip is inserted on a base and not soldered to de moderboard, oderwise you’ll have to unsolder it and den put de new one. In this case would be more convenient to solder a base on which you’ll den plug de new chip, in de eventuality that you’ll have to change it again. If you can’t find de BIOS chip specifically made for your moderboard, you should buy one of de same type (probably one of de ones shown above) and look in your moderboard manufacturer’s website to see if dere’s de BIOS image to download. Then you should copy that image on de chip you bought with an EPROM programmer.

Important
Wheder is de method you use, when you flash de BIOS not only de password, but also all de oder configuration data will be reset to de factory defaults, so when you are bootin’ for de first time after a BIOS flash, you should enter de CMOS configuration menu (as explained before) and fix up some thin’s.
Also, when you boot Windows, it may happen that it finds some new device, because of de new configuration of de BIOS, in this case you’ll probably need de Windows installation CD because Windows may ask you for some external files. If Windows doesn’t see de CD-ROM try to eject and re-insert de CD-ROM again. If Windows can’t find de CD-ROM drive and you set it properly from de BIOS config, just reboot with de reset key, and in de next run Windows should find it. However most files needed by de system while installin’ new hardware could also be found in C:WINDOWS, C:WINDOWSSYSTEM, or C:WINDOWSINF .

Key Disk for Toshiba laptops
Some Toshiba notebooks allow to bypass BIOS by insertin’ a “key-disk” in de floppy disk drive while bootin’. To create a Toshiba Keydisk, take a 720Kb or 1.44Mb floppy disk, format it (if it’s not formatted yet), den use a hex editor such as Hex Workshop (***.bpsoft.com/downloads/index.html) to change de first five bytes of de second sector (de one after de boot sector) and set them to 4B 45 59 00 00 (note that de first three bytes are de ASCII for “KEY” followed by two zeroes). Once you have created de key disk put it into de notebook’s drive and turn it on, den push de reset button and when asked for password, press Enter. You will be asked to Set Password again. Press Y and Enter. You’ll enter de BIOS configuration where you can set a new password.

Key protected cases
A final note about those old computers (up to 486 and early Pentiums) protected with a key that prevented de use of de mouse and de keyboard or de power button. All you have to do with them is to follow de wires connected to de key hole, locate de jumper to which dey are connected and unplug it.

All latest Moderboards today, 486/ Pentium / Pentium Pro etc.,ensure that upgrades are easily obtained by incorporatin’ de system BIOS in a FLASH Memory component. With FLASH BIOS, dere is no need to replace an EPROM component. Once downloaded, de upgrade utility fits on a floppy disc allowin’ de user to save, verify and update de system BIOS. A hard drive or a network drive can also be used to run de newer upgrade utilities. However, memory managers can not be installed while upgradin’.

Most pre-Pentium moderboards do not have a Flash BIOS. The followin’ instructions derefore do not apply to dese boards. If your moderboard does not have a Flash BIOS (EEPROM) you will need to use an EPROM programmer to re-program de BIOS chip. See your dealer for more information about this.

Please read de followin’ instructions in full before startin’ a Flash BIOS upgrade:

A. Create a Bootable Floppy (in DOS)

�With a non-formatted disk, type de followin’:

format a:/s

�If usin’ a formatted disk, type:

sys a:

This procedure will ensure a clean boot when you are flashin’ de new BIOS.

B. Download de BIOS file

�Download de correct BIOS file by clickin’ on de file name of de BIOS file you wish to download.

�Save de BIOS file and de Flash Utility file in de boot disk you have created. Unzip de BIOS file and de flash utility file. If you don’t have an “unzip” utility, download de WinZip for Windows 95 shareware/ evaluation copy for that one time use from _www.winzip.com or _www.pkware.com. Most CD ROMs found in computer magazines, have a shareware version of WinZip on them.

�You should have extracted two files:

Flash BIOS utility eg: flash7265.exe (for example)

BIOS eg: 6152J900.bin (example)

Use de latest flash utility available unless oderwise specified (eider on de BIOS update page or in de archive file). This information is usually provided.

C. Upgrade de System BIOS

Durin’ boot up, write down de old BIOS version because you will need to use it for de BIOS backup file name.

Place de bootable floppy disk containin’ de BIOS file and de Flash Utility in drive a, and reboot de system in MS-DOS, preferably Version 6.22

�At de A:> prompt, type de correspondin’ Flash BIOS utility and de BIOS file with its extension.

For example:

flash625 615j900.bin

�From de Flash Memory Writer menu, select “Y” to “Do you want to save BIOS?” if you want to save (back up) your current BIOS (strong’ly recommended), den type de name of your current BIOS and its extension after FILE NAME TO SAVE: eg: a:613J900.bin

Alternatively select “N” if you don’t want to save your current BIOS. Beware, though, that you won’t be able to recover from a possible failure.

�Select “Y” to “Are you sure to program?”

�Wait until it displays “Message: Power Off or Reset de system”

Once de BIOS has been successfully loaded, remove de floppy disk and reboot de system. If you write to BIOS but cannot complete de procedure, do not switch off, because de computer will not be able to boo, and you will not be given anoder chance to flash. In this case leave your system on until you resolve de problem (flashin’ BIOS with old file is a possible solution, provided you’ve made a backup before)

Make sure de new BIOS version has been loaded properly by takin’ note of de BIOS identifier as de system is rebootin’.

For AMI BIOS

Once de BIOS has been successfully loaded, remove de floppy disk and reboot de system holdin’ de “END” key prior to power on until you enter CMOS setup. If you do not do this de first time bootin’ up after upgradin’ de BIOS, de system will han’.

BIOS Update Tips

note:

1.Make sure never to turn off or reset your computer durin’ de flash process. This will corrupt de BIOS data. We also recommend that you make a copy of your current BIOS on de bootable floppy so you can reflash it if you need to. (This option is not available when flashin’ an AMI BIOS).

2. If you have problems installin’ your new BIOS please check de followin’:

Have you done a clean boot?

In oder words, did you follow de above procedure for makin’ a bootable floppy? This ensures that when bootin’ from “A” dere are no device drivers on de diskette. Failin’ to do a clean boot is de most common cause for gettin’ a “Memory Insufficient” error message when attemptin’ to flash a BIOS.

If you have not used a bootable floppy, insure a clean boot eider by

a) pressin’ F5 durin’ bootup

b) by removin’ all device drivers on de CONFIG.SYS includin’ de HIMEM.SYS. Do this by usin’ de EDIT command.

Have you booted up under DOS?

Bootin’ in Windows is anoder common cause for gettin’ a “Memory Insufficient” error message when attemptin’ to flash a BIOS. Make sure to boot up to DOS with a minimum set of drivers. Important: Bootin’ in DOS does not mean selectin’ “Restart computer in MS-DOS Mode” from Windows98/95 shutdown menu or goin’ to Prompt mode in WindowsNT, but rader followin’ de above procedure (format a: /s and rebootin’ from a:).

Have you entered de full file name of de flash utility and de BIOS plus its extension?
Do not forget that often you will need to add a drive letter (a:) before flashin’ de BIOS. Example: when asked for file name of new BIOS file which is on your floppy disk, in case you’re workin’ from c: your will need to type a:615j900.bin, rader than 615j900.bin only.

After repeated requests for beep codes i have decided to post them here maybe dey could be pinned

Standard Original IBM POST Error Codes

Code Description

1 short beep System is OK
2 short beeps POST Error - error code shown on screen No beep Power supply or system board problem Continuous beep Power supply, system board, or keyboard problem Repeatin’ short beeps Power supply or system board problem
1 lon’, 1 short beep System board problem
1 lon’, 2 short beeps Display adapter problem (MDA, CGA)
1 lon’, 3 short beeps Display adapter problem (EGA)
3 lon’ beeps 3270 keyboard card
IBM POST Diagnostic Code Descriptions
Code Description
100 - 199 System Board
200 - 299 Memory
300 - 399 Keyboard
400 - 499 Monochrome Display
500 - 599 Colour/Graphics Display
600 - 699 Floppy-disk drive and/or Adapter
700 - 799 Math Coprocessor
900 - 999 Parallel Printer Port
1000 - 1099 Alternate Printer Adapter
1100 - 1299 Asynchronous Communication Device, Adapter, or Port
1300 - 1399 Game Port
1400 - 1499 Colour/Graphics Printer
1500 - 1599 Synchronous Communication Device, Adapter, or Port
1700 - 1799 Hard Drive and/or Adapter
1800 - 1899 Expansion Unit (XT)
2000 - 2199 Bisynchronous Communication Adapter
2400 - 2599 EGA system-board Video (MCA)
3000 - 3199 LAN Adapter
4800 - 4999 Internal Mothem
7000 - 7099 Phoenix BIOS Chips
7300 - 7399 3.5″ Disk Drive
8900 - 8999 MIDI Adapter
11200 - 11299 SCSI Adapter
21000 - 21099 SCSI Fixed Disk and Controller
21500 - 21599 SCSI CD-ROM System

AMI BIOS Beep Codes

Code Description

1 Short Beep System OK
2 Short Beeps Parity error in de first 64 KB of memory
3 Short Beeps Memory failure in de first 64 KB
4 Short Beeps Memory failure in de first 64 KB Operational of memory
or Timer 1 on de moderboard is not functionin’
5 Short Beeps The CPU on de moderboard generated an error
6 Short Beeps The keyboard controller may be bad. The BIOS cannot switch to protected mode
7 Short Beeps The CPU generated an exception interrupt
8 Short Beeps The system video adapter is eider missin’, or its memory is faulty
9 Short Beeps The ROM checksum value does not match de value encoded in de BIOS
10 Short Beeps The shutdown register for CMOS RAM failed
11 Short Beeps The external cache is faulty
1 Lon’, 3 Short Beeps Memory Problems
1 Lon’, 8 Short Beeps Video Card Problems

Phoenix BIOS Beep Codes

Note - Phoenix BIOS emits three sets of beeps, separated by a brief pause.

Code Description
1-1-3 CMOS read/write failure
1-1-4 ROM BIOS checksum error
1-2-1 Programmable interval timer failure
1-2-2 DMA initialisation failure
1-2-3 DMA page register read/write failure
1-3-1 RAM refresh verification failure
1-3-3 First 64k RAM chip or data line failure
1-3-4 First 64k RAM odd/even logic failure
1-4-1 Address line failure first 64k RAM
1-4-2 Parity failure first 64k RAM
2-_-_ Faulty Memory
3-1-_ Faulty Moderboard
3-2-4 Keyboard controller Test failure
3-3-4 Screen initialisation failure
3-4-1 Screen retrace test failure
3-4-2 Search for video ROM in progress
4-2-1 Timer tick interrupt in progress or failure
4-2-2 Shutdown test in progress or failure
4-2-3 Gate A20 failure
4-2-4 Unexpected interrupt in protected mode
4-3-1 RAM test in progress or failure>ffffh
4-3-2 Faulty Moderboard
4-3-3 Interval timer channel 2 test or failure
4-3-4 Time of Day clock test failure
4-4-1 Serial port test or failure
4-4-2 Parallel port test or failure
4-4-3 Math coprocessor test or failure
Low 1-1-2 System Board select failure
Low 1-1-3 Extended CMOS RAM failure

Beep Code Manual, Better Than Gold Techies, American Megatrends Int. & Phoenix

BIOS Beep Codes

When a computer is first turned on, or rebooted, its BIOS performs a power-on self test (POST) to test de system’s hardware, checkin’ to make sure that all of de system’s hardware components are workin’ properly. Under normal circumstances, de POST will display an error message; however, if de BIOS detects an error before it can access de video card, or if dere is a problem with de video card, it will produce a series of beeps, and de pattern of de beeps indicates what kind of problem de BIOS has detected.
Because dere are many brands of BIOS, dere are no standard beep codes for every BIOS.

The two most-used brands are AMI (American Megatrends International) and Phoenix.

Below are listed de beep codes for AMI systems, and here are de beep codes for Phoenix systems.

AMI Beep Codes

Beep Code Meanin’
1 beep DRAM refresh failure. There is a problem in de system memory or de moderboard.
2 beeps Memory parity error. The parity circuit is not workin’ properly.
3 beeps Base 64K RAM failure. There is a problem with de first 64K of system memory.
4 beeps System timer not operational. There is problem with de timer(s) that control functions on de moderboard.
5 beeps Processor failure. The system CPU has failed.
6 beeps Gate A20/keyboard controller failure. The keyboard IC controller has failed, preventin’ gate A20 from switchin’ de processor to protect mode.
7 beeps Virtual mode exception error.
8 beeps Video memory error. The BIOS cannot write to de frame buffer memory on de video card.
9 beeps ROM checksum error. The BIOS ROM chip on de moderboard is likely faulty.
10 beeps CMOS checksum error. Somethin’ on de moderboard is causin’ an error when tryin’ to interact with de CMOS.
11 beeps Bad cache memory. An error in de level 2 cache memory.
1 lon’ beep, 2 short Failure in de video system.
1 lon’ beep, 3 short A failure has been detected in memory above 64K.
1 lon’ beep, 8 short Display test failure.
Continuous beepin’ A problem with de memory or video.
BIOS Beep Codes

Phoenix Beep Codes

Phoenix uses sequences of beeps to indicate problems. The “-” between each number below indicates a pause between each beep sequence. For example, 1-2-3 indicates one beep, followed by a pause and two beeps, followed by a pause and three beeps. Phoenix version before 4.x use 3-beep codes, while Phoenix versions startin’ with 4.x use 4-beep codes. Click here for AMI BIOS beep codes.
4-Beep Codes
Beep Code Meanin’
1-1-1-3 Faulty CPU/moderboard. Verify real mode.
1-1-2-1 Faulty CPU/moderboard.
1-1-2-3 Faulty moderboard or one of its components.
1-1-3-1 Faulty moderboard or one of its components. Initialize chipset registers with initial POST values.
1-1-3-2 Faulty moderboard or one of its components.
1-1-3-3 Faulty moderboard or one of its components. Initialize CPU registers.
1-1-3-2
1-1-3-3
1-1-3-4 Failure in de first 64K of memory.
1-1-4-1 Level 2 cache error.
1-1-4-3 I/O port error.
1-2-1-1 Power management error.
1-2-1-2
1-2-1-3 Faulty moderboard or one of its components.
1-2-2-1 Keyboard controller failure.
1-2-2-3 BIOS ROM error.
1-2-3-1 System timer error.
1-2-3-3 DMA error.
1-2-4-1 IRQ controller error.
1-3-1-1 DRAM refresh error.
1-3-1-3 A20 gate failure.
1-3-2-1 Faulty moderboard or one of its components.
1-3-3-1 Extended memory error.
1-3-3-3
1-3-4-1
1-3-4-3 Error in first 1MB of system memory.
1-4-1-3
1-4-2-4 CPU error.
1-4-3-1
2-1-4-1 BIOS ROM shadow error.
1-4-3-2
1-4-3-3 Level 2 cache error.
1-4-4-1
1-4-4-2
2-1-1-1 Faulty moderboard or one of its components.
2-1-1-3
2-1-2-1 IRQ failure.
2-1-2-3 BIOS ROM error.
2-1-2-4
2-1-3-2 I/O port failure.
2-1-3-1
2-1-3-3 Video system failure.
2-1-1-3
2-1-2-1 IRQ failure.
2-1-2-3 BIOS ROM error.
2-1-2-4 I/O port failure.
2-1-4-3
2-2-1-1 Video card failure.
2-2-1-3
2-2-2-1
2-2-2-3 Keyboard controller failure.
2-2-3-1 IRQ error.
2-2-4-1 Error in first 1MB of system memory.
2-3-1-1
2-3-3-3 Extended memory failure.
2-3-2-1 Faulty moderboard or one of its components.
2-3-2-3
2-3-3-1 Level 2 cache error.
2-3-4-1
2-3-4-3 Moderboard or video card failure.
2-3-4-1
2-3-4-3
2-4-1-1 Moderboard or video card failure.
2-4-1-3 Faulty moderboard or one of its components.
2-4-2-1 RTC error.
2-4-2-3 Keyboard controller error.
2-4-4-1 IRQ error.
3-1-1-1
3-1-1-3
3-1-2-1
3-1-2-3 I/O port error.
3-1-3-1
3-1-3-3 Faulty moderboard or one of its components.
3-1-4-1
3-2-1-1
3-2-1-2 Floppy drive or hard drive failure.
3-2-1-3 Faulty moderboard or one of its components.
3-2-2-1 Keyboard controller error.
3-2-2-3
3-2-3-1
3-2-4-1 Faulty moderboard or one of its components.
3-2-4-3 IRQ error.
3-3-1-1 RTC error.
3-3-1-3 Key lock error.
3-3-3-3 Faulty moderboard or one of its components.
3-3-3-3
3-3-4-1
3-3-4-3
3-4-1-1
3-4-1-3
3-4-2-1
3-4-2-3
3-4-3-1
3-4-4-1
3-4-4-4 Faulty moderboard or one of its components.
4-1-1-1 Floppy drive or hard drive failure.
4-2-1-1
4-2-1-3
4-2-2-1 IRQ failure.
4-2-2-3
4-2-3-1
4-2-3-3
4-2-4-1 Faulty moderboard or one of its components.
4-2-4-3 Keyboard controller error.
4-3-1-3
4-3-1-4
4-3-2-1
4-3-2-2
4-3-3-1
4-3-4-1
4-3-4-3 Faulty moderboard or one of its components.
4-3-3-2
4-3-3-4 IRQ failure.
4-3-3-3
4-3-4-2 Floppy drive or hard drive failure.
3-Beep Codes
Beep Code Meanin’
1-1-2 Faulty CPU/moderboard.
1-1-3 Faulty moderboard/CMOS read-write failure.
1-1-4 Faulty BIOS/BIOS ROM checksum error.
1-2-1 System timer not operational. There is a problem with de timer(s) that control functions on de moderboard.
1-2-2
1-2-3 Faulty moderboard/DMA failure.
1-3-1 Memory refresh failure.
1-3-2
1-3-3
1-3-4 Failure in de first 64K of memory.
1-4-1 Address line failure.
1-4-2 Parity RAM failure.
1-4-3 Timer failure.
1-4-4 NMI port failure.
2-_-_ Any combination of beeps after 2 indicates a failure in de first 64K of memory.
3-1-1 Master DMA failure.
3-1-2 Slave DMA failure.
3-1-3
3-1-4 Interrupt controller failure.
3-2-4 Keyboard controller failure.
3-3-1
3-3-2 CMOS error.
3-3-4 Video card failure.
3-4-1 Video card failure.
4-2-1 Timer failure.
4-2-2 CMOS shutdown failure.
4-2-3 Gate A20 failure.
4-2-4 Unexpected interrupt in protected mode.
4-3-1 RAM test failure.
4-3-3 Timer failure.
4-3-4 Time of day clock failure.
4-4-1 Serial port failure.
4-4-2 Parallel port failure.
4-4-3 Math coprocessor.