I unplugged the power adaptor and suddenly, my mac started beeping repeatedly like an alarm. What does this mean?
I unplugged the power adaptor and suddenly, my mac started beeping repeatedly like an alarm. My mac was fully charged and would not start up. I pressed down on the restart button to reboot it and the noise stopped.
What does this mean?
Hi, it indicates a RAM problem, (or Logic Board around the RAM).
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.
http://support.apple.com/kb/ht1547
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