This document contributed to the Computer Technology Documentation Project by:

Table of Contents

Rob Hazelton

  Beep Codes, IBM & Macintosh BIOS beep codes

IBM BIOS beep codes
The IBM beep codes consist of short and long beeps, similar to the Award BIOS codes although the IBM codes are a lot more descriptive.

Beep Code
No Beeps No Power, Loose Card, or Short.
1 Short Beep Normal POST, Computer is ok.
2 Short Beeps POST error, review screen for error code.
Continuous Beeps No Power, Loose Card, or Short.
Repeating Short Beeps No Power, Loose Card, or Short.
1 Long & 1 Short Beeps Motherboard issue.
1 Long & 2 Short Beeps Video (Mono/CGA) Display circuitry.
1 Long & 3 Short Beeps Video (EGA) Display circuitry.
3 Long Beeps Keyboard / Keyboard card error.
1 Beep, Blank or Incorrect Display Video Display Circuitry.

Macintosh Start-up tones
Modern Macs beep when they fail there POST, the beeps will depend on the model but here are the standard codes.

Beep Code Description
Error Tone. (two sets of different tones) Problem with logic board or SCSI bus.
Start-up tone, drive spins, no video. Problem with video controller.
Powers on, no tone. Logic board problem.
High Tone, 4 Higher Tones Problem with SIMM.

Next: Phoenix BIOS beep codes

Legal Disclaimer |Copyright Notice
Copyright Totally Hardware 2002-2003