I am running a headless mini on 10.9.2. It is used as a media server. My problem is I can't stop it from sleeping. I have tried the following: Energy Saver preferences set as follows: Computer Sleep - Never Display Sleep - 1 Minute Put Hard disk to sleep box - Unchecked Wake for Network access - Checked Startup after Power Failure - Checked Enable Power Nap - Unchecked I have also installed Caffeine and it is set to indefinite. Despite all the above the Mac mini still goes into sleep mode! Any help much appreciated as I can't come up with any thing else to do.