Sorry if this has been answered before; But recently my macbook pro won't go to sleep on it's own due to inactivity. It goes to sleep fine on it's own when I either shut the lid or tell it to go sleep from the apple menu. My energy saving settings are identical for both power and battery (3 min display sleep, 10 min computer sleep). Reason how I know it won't sleep is because the light on the base of the computer is still solid and not flashing. The only thing I can think of is either my hard drive which is the momentus XT (SD26) or gfxcardstatus. I'm pretty sure it's not gfxcardstatus cause I run that on my 2011 MBA and it goes to sleep just fine. Any solutions or inputs would be nice.