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 beeps if it finds a fault. The power LED may flash too. One, two or three beeps points the finger at RAM modules (see http://www.support.apple.com/kb/HT1547 ). Try easing them into place, in case they've become unseated. Go to http://www.apple.com/support and search for 'install memory' and your Mac's model name. Four or 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, then submit a Ticket request.
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