iMac will not sleep and freezes ??

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My 20" imac Intel will not sleep. It goes into sleep mode for about 5-10 seconds and then comes back on. It also freezes when powering down about half the time. I already re-installed the OS (10.4) and that did nothing. Anyone have an idea of what's wrong?
 
Joined
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Your Mac's Specs
MacBook Pro | iMac(2.1 G5) | MacBook(2.16 C2D) | MacMini (1.67 CD) | iPhone 4 | iPad (3rd Gen)
Sometimes it comes back on if a background application suddenly becomes active.

Do a hardware test using your installation disks for errors.
 

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