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BIOS Beep Codes

By , Saturday 10th February 2001 in Hardware

Decode the sequence of beeps to determine a BIOS or system error.

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

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Tim Trott

Tim is a professional software engineer, designer, photographer and astronomer from the United Kingdom. You can follow him on Twitter to get the latest updates.

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