A total lack of response
to the power button could mean a blown fuse in the plug, so check first.
If it's not completely dead, the Mac will do a 'power-on self-test'
(POST) as it boots up, and beep if it finds a fault. The power LED may
flash too.
One, two or three beeps points the finger at RAM modules (see here for more info). Try easing them into place, in case they've become unseated. Your manual will tell you how to get at the RAM, or go to www.apple.com/support and search for 'install memory' and your Mac's model name.
Four
and five beeps indicate problems with the system ROM or processor,
while the Air also has an 'SOS' code consisting of three short, three
long and then three short beeps. If you hear these, seek professional
Mac help.
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