No display and fans ramp up while trying to wake from sleep.

For the past week every time I go to wake my computer from sleep, nothing happens at first, and then my computer fans ramp up and I have to hold the power button to stop it. I have already tried resetting my SMU, but that didn't seem to do anything. I also tried reseting my pram. I'm guessing it's probably that my logic board is going, but I was wondering if anyone has heard of this before and had any fixes. Thanks.

Which "model" & generation G5 iMac do you have?
Need this info so that the knowledgeable users can provide you with the proper troubleshooting solution(s).
http://docs.info.apple.com/article.html?artnum=301724-en How to identify your iMac
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh355.html Getting information about your computer
In the meantime, check to see if your model qualifies for the G5 iMac Repair Programs
**WARNING: DUE TO SECURITY REASONS, PLEASE DO NOT POST YOUR COMPUTER'S SERIAL NUMBER ON THESE MESSAGE BOARDS.**

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