Bill, As Valter suggested, overheating is a prime suspect. I had an iMac G5 whose display began to act up after almost five years of trouble-free use and the fans began blowing loud. I found that the circular air vent under the support arm was plugged solid with dust. Using the open end of our vacuum cleaner's attachments hose, I cleaned out all the dust in the vent and presto! the iMac began to work normally again. I also opened the RAM port at the bottom and found very little dust actually inside the iMac. It ran well for another year and a half before it developed a fatal freeze-up problem due to a failure on the logic board.
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