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BIOS Beep Codes

When a PC starts up, the first thing it does is run a Power-on Self Test (POST) to test the computers hardware. If it detects an error, you will be notified by either a number of audio beeps or an error message on the screen. This page helps to explain what the error message or audio beeps mean.

Standard Original IBM POST Error Codes

1 short beepSystem is OK
2 short beepsPOST Error - error code shown on screen
No beepPower supply or system board problem
Continuous beepPower supply, system board, or keyboard problem
Repeating short beeps     Power supply or system board problem
1 long, 1 short beepSystem board problem
1 long, 2 short beepsDisplay adapter problem (MDA, CGA)
1 long, 3 short beepsDisplay adapter problem (EGA)
3 long beeps3270 keyboard card

IBM POST Diagnostic Code Descriptions

100 - 199System Board
200 - 299Memory
300 - 399Keyboard
400 - 499Monochrome Display
500 - 599Colour/Graphics Display
600 - 699Floppy-disk drive and/or Adapter
700 - 799Math Coprocessor
900 - 999Parallel Printer Port
1000 - 1099Alternate Printer Adapter
1100 - 1299Asynchronous Communication Device, Adapter, or Port
1300 - 1399Game Port
1400 - 1499Colour/Graphics Printer
1500 - 1599Synchronous Communication Device, Adapter, or Port
1700 - 1799Hard Drive and/or Adapter
1800 - 1899Expansion Unit (XT)
2000 - 2199Bisynchronous Communication Adapter
2400 - 2599EGA system-board Video (MCA)
3000 - 3199LAN Adapter
4800 - 4999Internal Modem
7000 - 7099Phoenix BIOS Chips
7300 - 73993.5" Disk Drive
8900 - 8999MIDI Adapter
11200 - 11299     SCSI Adapter
21000 - 21099SCSI Fixed Disk and Controller
21500 - 21599SCSI CD-ROM System

AMI BIOS Beep Codes

1 Short BeepSystem OK
2 Short BeepsParity error in the first 64 KB of memory
3 Short BeepsMemory failure in the first 64 KB
4 Short BeepsMemory failure in the first 64 KB Operational of memory
or Timer 1 on the motherboard is not functioning
5 Short BeepsThe CPU on the motherboard generated an error
6 Short BeepsThe keyboard controller may be bad. The BIOS cannot switch to protected mode
7 Short BeepsThe CPU generated an exception interrupt
8 Short BeepsThe system video adapter is either missing, or its memory is faulty
9 Short BeepsThe ROM checksum value does not match the value encoded in the BIOS
10 Short BeepsThe shutdown register for CMOS RAM failed
11 Short BeepsThe external cache is faulty
1 Long, 3 Short Beeps  Memory Problems
1 Long, 8 Short BeepsVideo Card Problems

Phoenix BIOS Beep Codes

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

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