My iMac monitor will flash sometimes.

My iMac monitor got some problem.
It won't turn on during startup but it will turn on after a minute.
Sometimes, my iMac monitor will flash suddenly.
What's the problem?
Message was edited by: itgoodlonglong

Turn off the iMac, unplug the power cord for 30 seconds. Plug it back in... Hold down the COMM+Option+P+R keys when you turn the iMac back on, kept them held down. When you hear the starup chime twice, let go of the keys.
If this does not work, make sure you have unplugged all external devices and reboot again.
If that all does not work, take her into a ARS...
Hope this helps.

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