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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