Computer POST and beep codes
American Megatrends' AMI BIOS
1 - The memory refresh circuitry has failed
2 - Parity errors have been detected in the first 64 KB of memory
3 - A failure has occurred within the first 64 KB or memory
4 - System Timer failure: Timer 1 on the mainboard does not work properly
5 - The CPU has generated an undetectable error
6 - 8042 Gate-A20 failure: BIOS cannot switch the CPU into protected mode
7 - The CPU has generated an exception error
8 - The video adapter is missing, or the memory on the adapter has generated a failure
9 - The ROM checksum value does not match the value in BIOS
10 - The shutdown register for CMOS interrupt channel 2 has failed POST; the system board cannot retrieve CMOS contents during POST
11 - Level-2 cache memory has failed the tests, and has been disabled
2 short - POST has failed, caused by a failure of one of the hardware tests
1 long, 2 short - Failure in video system: a checksum error was encountered in video BIOS ROM, or a horizontal retrace failure has been encountered
1 long, 3 short - Failure in video system: the video DAC, the monitor detection procedure or the video RAM has failed
1 long - POST procedures have passed
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AMI BIOS
Beeps Descriptions
1 short - DRAM refresh failure
2 short - Parity circuit failure
3 short - Base 64K RAM failure
4 short - System timer failure
5 short - Process failure
6 short - Keyboard controller Gate A20 error
7 short - Virtual mode exception error
8 short - Display memory Read/Write test failure
9 short - ROM BIOS checksum failure
10 short - CMOS shutdown Read/Write error
11 short - Cache Memory error
1 long, 3 short - Conventional/Extended memory failure
1 long, 8 short - Display/Retrace test failed
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AST Research BIOS
Long Beep Short Beep Descriptions
0 1 - Low level processor verification test failed (POST 1)
0 2 - Clearing keyboard controller buffers failed (POST 2)
0 3 - Keyboard controller reset failed (POST 3)
0 4 - Low level keyboard controller interface test (POST 4)
0 5 - Reading data from keyboard controller failed (POST 5)
0 6 - System board support chip initialization failed (POST 6)
0 7 - Processor register read/write verify test failed (POST 7)
0 8 - CMOS timer initialization failed (POST 8)
0 9 - ROM BIOS checksum test failed (POST 9)
0 10 - Initialize primary video (POST 10)
0 11 - 8254 timer channel 0 test failed (POST 11)
0 12 - 8254 timer channel 1 test failed (POST 12)
0 13 - 8254 timer channel 2 test failed (POST 13)
0 14 - CMOS power-on and time test failed (POST 14)
0 15 - CMOS shutdown byte test failed (POST 15)
1 0 - DMA channel 0 test failed (POST 16)
1 1 - DMA channel 1 test failed (POST 17)
1 2 - DMA page register test failed (POST 18)
1 3 - Keyboard controller interface test failed (POST 19)
1 4 - Memory refresh toggle test failed (POST 20)
1 5 - First 64 KB memory test failed (POST 21)
1 6 - Setup interrupt vector table failed (POST 22)
1 7 - Video initialization failed (POST 23)
1 8 - Video memory test failed (POST 24)
