I recently noticed that after upgrading my Mac Mini (late 2012) to Maverick, for some reason, the energy saver options do not seem to kick in and the computer never sleeps. All energy saver options are set to default, the Monitors enter the power saving mode at the predefined time (10 mins), but the Mac Mini never sleeps. If I manually select "Sleep" from the OS menu, the PC sleeps just fine but I would really like to get my Mac Mini to sleep automatically after 10 mins of inactivity. Any ideas on how to find the reason/process/application that stops my Mac Mini from sleeping according to the Energy Saver settings?