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BIOS Beep Codes

When a computer is turned on, it goes through what is called a POST (power-on self test) routine.  This is a short diagnostic procedure incorporated into the boot sequence by the BIOS manufacture for troubleshooting purposes. 

Many times when there is an error in your boot sequence you will receive an on-screen error message. This error was printed by the video card. But, in some cases, the error is detected early in the boot process and the error cannot be received by the video card. The problem may even be caused by the video card or the monitor.  This is why the need for beep codes came to be. 

Below, you will find some common codes listed by manufacturer.

 

 Use the information below at your own risk.  See "Terms of use"

 

 

AMI (American Megatrends') BIOS

Beep Codes

Message

one short DRAM refresh failure (Problem with memory)
two short Parity circuit failure
three short Base 64K RAM failure
four short System Timer failure
five short Processor failure
six short Keyboard Controller / Gate A20 failure
seven short Virtual Mode Exception error
eight short Display Memory Read/Write failure (fault with video card)
nine short ROM BIOS Checksum error (fault with BIOS chip)
ten short CMOS Shutdown Read/Write error
eleven short Cache memory
one long Passed (no errors)
one long, two short Video failure
one long, three short Base / Extended Memory failure
one long, eight short Display / Retrace Test failure

AST Research BIOS

Beep Codes 

Message 

one short Low level processor verification test failed (POST 1)
two short Clearing keyboard controller buffers failed (POST 2)
three short Keyboard controller reset failed (POST 3)
four short Low level keyboard controller interface test (POST 4) 
five short Reading data from keyboard controller failed (POST 5) 
six short System board support chip initialization failed (POST 6)
seven short Processor register read/write verify test failed (POST 7) 
eight short CMOS timer initialization failed (POST 8) 
nine short ROM BIOS checksum test failed (POST 9) 
ten short Initialize primary video (POST 10) 
eleven short 8254 timer channel 0 test failed (POST 11) 
twelve short 8254 timer channel 1 test failed (POST 12) 
thirteen short 8254 timer channel 2 test failed (POST 13) 
fourteen short CMOS power-on and time test failed (POST 14) 
fifteen short CMOS shutdown byte test failed (POST 15) 
one long DMA channel 0 test failed (POST 16)
one long, one short DMA channel 1 test failed (POST 17) 
one long, two short DMA page register test failed (POST 18) 
one long, three short Keyboard controller interface test failed (POST 19) 
one long, four short Memory refresh toggle test failed (POST 20) 
one long, five short First 64 KB memory test failed (POST 21) 
one long, six short Setup interrupt vector table failed (POST 22) 
one long, seven short Video initialization failed (POST 23) 
one long, eight short Video memory test failed (POST 24) 

Award BIOS 

Beep Codes

Message 

one short Passed (no errors) 
two short Any non-fatal error 
one long, two short Video failure 
one long, three short Keyboard Controller failure (applies to 286, 386 and 486) 

Compaq BIOS

Beep Codes

Message 

one short Indicates that the system is booting properly
two short General BIOS error - remedy unknown
one short, two long Memory Module
one long, one short BIOS ROM checksum error
one long, two short Video error
7 Beeps: one long, one short, one long, one short, pause, one long, two short AGP Video
one long continuous tone Memory Module

IBM BIOS 

Beep Codes

Message 

none Power Supply or System Board failure (possible short) 
one short  Passed (no errors) 
one short (blank screen) Video error (check cable) 
one short (no boot) Floppy Drive error 
two short Configuration Error (displayed on screen) 
repeating short Power Supply or System Board failure 
continuous Power Supply or System Board / Keyboard stuck 
one long, one short System Board failure 
one long, two short Video (Mono/CGA) failure (check cable) 
one long, three short  Video (EGA) failure (check cable) 
three long Keyboard Card error 

Mylex BIOS

Beep Codes

Message 

one Normal boot
two Video adapter error
three Keyboard controller error
four Keyboard error
five PIC 0 error
six PIC 1 error
seven DMA page register error
eight RAM refresh error
nine RAM data error
ten RAM parity error
eleven DMA controller 0 error
twelve CMOS RAM error
thirteen DMA controller 1 error
fourteen CMOS RAM battery error
fifteen CMOS RAM checksum error
sixteen BIOS ROM checksum error

Mylex 386 BIOS

Beep Codes

Message 

one long Normal boot
two long Video adapter error
one long, one short, one long Keyboard controller error
one long, two short, one long Keyboard error
one long, three short, one long PIC 0 error
one long four short, one long PIC 1 error
one long, five short, one long DMA page register error
one long, six short, one long RAM refresh error
one long, seven short, one long RAM data error
one long, eight short, one long RAM parity error
one long, nine short, one long DMA controller 0 error
one long, ten short, one long CMOS RAM error
one long, eleven short, one long DMA controller 1 error
one long, twelve short, one long CMOS RAM battery error
one long, thirteen short, one long CMOS RAM checksum error
one long fourteen short, one long BIOS ROM checksum error

Phoenix BIOS 

Beep Codes 

Message 

one, one, three CMOS Read/Write 
one, one, four ROM BIOS Checksum failure 
one, two, one Programmable Interval Timer failure 
one, two, two DMA Initialisation failure 
one, two, three DMA Page Register Read/Write failure 
one, three, one RAM Refresh Verification error 
one, three, three First 64K RAM Chip/Data Line failure 
one, three, four First 64K RAM Odd/Even Logic 
one, four, one First 64K RAM: Address Line 
one, four, two First 64K RAM: Parity failure 
one, four, three Fail-Safe Timer Feature (EISA only) 
one, four, four Software NMI Port failure (EISA only) 
two (followed by various combinations) First 64K RAM Chip/Data Line failure (combinations indicate which bit) 
three, one, one Slave DMA Register failure 
three, one, two Master DMA Register failure 
three, one, three Master Interrupt Mask Register failure 
three, one, four Slave Interrupt Mask Register failure 
three, two, four Keyboard Controller failure 
three, three, four Display Memory failure 
three, four, one Display Retrace failure 
three, four, two Video ROM search proceeding 
four, two, one Timer Tick failure 
four, two, two Shutdown failure 
four, two, three Gate A20 failure 
four, two, four Unexpected Interrupt in Protected Mode 
four, three, one RAM test above 64K failure 
four, three, two/three Programmable Interval Timer, Channel 2 failure 
four, three, four Realtime Clock failure 
four, four, one Serial Port error 
four, four, two Parallel Port error 
four, four, three Math Co-processor failure 
(tone) one, one, two System Board Select 
(tone) one, one, three Extender CMOS RAM 

Quadtel BIOS

Beep Codes

Message 

one short Indicates that the system is booting properly
two short CMOS IC error
one long, two short Video error
one long, three short Peripheral controller error

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