Mac doesn't sleep automatically

just out of blue mac won't sleep automatically.

can force sleep using hardware button on mac of mac.

when don't screen turns off, mac still awake.

there advice can offer find culprit of whats happening here?

cheers

 

you may find useful ideas here:

mac os x: why mac might not sleep or stay in sleep mode
determine why mac wakes sleep
one sleep problem caused printers - solved

 

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