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The screen on my iMac lights up upon startup however about 2 seconds later goes dark. It sounds like the hard drive is running but no screen. Occassionally, (ever 30th try) it may go through the entire startup but then shut down a minute or two later. The condition has been getting progressively worse over the past 3 months. Now it is very hard to get the screen to light up beyond the 2 seconds.
Try resetting the SMC How to reset the SMC of your Mac - Apple Support
and NVRAM Reset NVRAM or PRAM on your Mac - Apple Support
then try restarting in safe mode How to use safe mode on your Mac - Apple Support
Try resetting the SMC How to reset the SMC of your Mac - Apple Support
and NVRAM Reset NVRAM or PRAM on your Mac - Apple Support
then try restarting in safe mode How to use safe mode on your Mac - Apple Support
IMAC 27" SCREEN GOES BLACK
