Imac won't sleep.

i've had problem few days now. when enter sleep mode, imac go sleep mode. computer keep running. (the screen fades black that's it).

imho it's not fan, because when power on again screen there (faster supposed pop up).

don't know do, way can stop mac running shutting him down. know not mac.

have imac 2011 base model , i'm running latest version of lion.

if knows do, please tell me.

 

are sure you're not putting display sleep, instead of computer? how doing it?

mac os x: why mac might not sleep or stay in sleep mode
determine why mac wakes sleep

 

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