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BIOS and its Beep Codes

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 Repeating short beeps Power supply or system board problem

1 long, 1 short beep System board problem

1 long, 2 short beeps Display adapter problem (MDA, CGA)

1 long, 3 short beeps Display adapter problem (EGA)

3 long 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 – 1399GamePort

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 Modem

7000 – 7099PhoenixBIOS Chips

7300 – 7399 3.5″ Disk Drive

8900 – 8999MIDIAdapter

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 the first 64 KB of memory

3 Short Beeps Memory failure in the first 64 KB

4 Short Beeps Memory failure in the first 64 KB Operational of memory

or Timer 1 on the motherboard is not functioning

5 Short Beeps The CPU on the motherboard 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 either missing, or its memory is faulty

9 Short Beeps The ROM checksum value does not match the value encoded in the BIOS

10 Short Beeps The shutdown register for CMOS RAM failed

11 Short Beeps The external cache is faulty

1 Long, 3 Short Beeps Memory Problems

1 Long, 8 Short Beeps Video Card Problems


PhoenixBIOS Beep Codes

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

Code Description

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

Low1-1-2System Board select failure

Low1-1-3Extended CMOS RAM failure

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