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LIS Documentation

LIS Documentation

Apple Computer Beep Codes

Tone(s) =  Description

  • 1 tone, a 5-second pause, repeat = No RAM installed
  • 3 successive tones, a 5-second pause, 3 successive tones =  RAM does not pass data integrity check
  • 1 long tone when holding down the power button = Firmware upgrade in process.
  • 3 long tones, 3 short tones, 3 long tones = Firmware restoration from CD in process.

The power on self-test resides in the ROM of the computer. This test runs whenever the computer is turned on after being fully shut down (the power-on self-test does not run if the computer is only restarted).

If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance.

  • 1 beep = no RAM installed
  • 2 beeps = incompatible RAM types
  • 3 beeps = no good banks
  • 4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
  • 5 beeps = processor is not usable

In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.

Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.

Sources: http://support.apple.com/kb/HT1547

http://support.apple.com/kb/HT2538

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