Imac5 cpu is running at 100% with no programs running.  How do I figure out what is causing this?

My fan is running constantly and the cpu is at 100% without opening any programs.  It just started doing this yesterday.  I erased the console logs and that didn't help.  I've been looking on line for other possibilities, but not finding much.  I hope someone has some ideas.

Try checking User>Applications>Utilities>Activity Monitor and see what's using up all the CPU.  If nothing shows up, then your power supply unit is faulty, leading your machine to think it's overheating.  You can also check in Console to see if there's any mention of maximum temperatures being exceeded (just enter those words in the little window at the upper right of the Console window).

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