Monitor won't sleep


even though i've had same setting (monitor goes sleep after 10mins) since got alum mbp 18 months ago, monitor not sleep. stays on. restart...sometimes sleep (after appropriate inactivity) , won't. don't have screen saver of sort enabled...just monitor goes off @ 10 mins.

, yes i'm positive mouse isn't being moved or keys pressed.

ideas?
 

what application leave active when happens? find applications tempremental - e.g. safari, if there flash on website screen not sleep.

go finder , make active, screen sleep me.
 


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