There is a bright light... then nothing...
Hey all. I have a lovely 27" iMac i bought in March 2010. Today, I went to wake
it up and the screen flashed, then it went blank and wouldn't come back.
It will now not reboot, after resetting the PRAM, I now always get the startup tone,
sometimes after that I get a flash of the grey screen, but then, nothing... it sounds
like the drive runs a little, but it clearly doesn't boot up.
Things I've tried:
1) reset PRAM
2) boot in recovery mode
3) boot in safe mode
4) I took all the ram out and just cleaned the dust off, inserted various combinations
hoping it was bad ram, still nothing.
The Mac is running Mountain Lion, latest version. 8gigs of Ram.
Thanks for any suggestions.
Sounds like a hardware failure, run Apple Hardware Test in extended mode at least 2-3 times in succession. If error codes appear it's a confirmed hardware failure that needs repair at your local Apple Store or AASP. If the machine is still covered by AppleCare then the repair will be covered. If no errors appear then still take it in, AHT is not the most reliable test. The techs have better tools available to them, that you don't have access to. BTW don't bother to ask what the AHT error codes mean, Apple does not publish that information.
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