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Beep Code Errors 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 - 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 Modem
- 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 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
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 Motherboard
- 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 Motherboard
- 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
