20"iMac Display Suddenly Goes Black

While I am using my iMac, occasionally suddenly goes black. If I hit a key (usually the space bar), it comes back as if I had put it to sleep.
What is happening? What should be done? What can I do?
Thanks for your help and information.

"Answered on another forum"
What a way to be helpful! I went through your posts and searched "display" and I did not find this mysterious answer you talk about.
I'm having the same issues on my Intel Core 2 Duo 20" iMac. if ANYONE could post a solution, I'd appreciate it.
The computer is still working correctly. It is not on sleep mode. I've press the power button and it goes to sleep, but then when I wake it up it repeats the black screen a couple of times until it finally settles on letting me work.
What is the point of user support forum if there are no moderators around to help people out? :/

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