PB used to sleep, now it won't

My PB used to abide by the System Preference energy settings I would set, but for about 7-10 days now, it doesn't.
It will sleep if I manually put it to sleep through the Finder. And it will sleep if I shut the lid.
But if I leave it alone, it just stays awake. The display will sleep, but not the hard disk. I hadn't adjusted the System Prefs at all when it started doing this. It does it:
- whether it's plugged in (AC) or on battery
- whether there are open apps or no apps at all
- whether peripherals are plugged in or not
Any ideas???

Try:                                               
- iOS: Not responding or does not turn on           
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try another cable                                                       
- Try on another computer                                                       
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar                                     

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