My mac's screen shuts down after a prolonged spinning wheel but I can still hear the computer whirring which tells me the computer is still functioning what could this problem be.  I cant get onto my computer with a black screen

I have a an Imac which the screen takes it upon itself to shut down after a prolonged spinning wheel.  The computer is still working as I can hear it.  I cant provide the specs as I cant see anything on my screen what could the problem be and how can I fix it.  I have turned it on and off a couple of times at both the button at the back and unplugged it but this hasnt helped.  Please help

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http://discussions.apple.com/docs/DOC-6413 and post to the appropriate forum: http://discussions.apple.com/docs/DOC-2463 after checking this tip on what may be slowing you down: http://discussions.apple.com/docs/DOC-6921

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