Difference between revisions of "Apple Computer Beep Codes"

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Tone(s) =  Description
Deprecated content: see https://support.apple.com for diagnostic assistance
*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

Latest revision as of 21:04, 26 July 2022

Deprecated content: see https://support.apple.com for diagnostic assistance

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