When I return to my Mac Mini in the morning, the case is warm to the touch, even though at that point it's been sleeping for hours with the display off.
According to https://www.apple.com/environment/pdf/products/archive/2014/Macmini_PER_feb2014.pdf and https://www.apple.com/environment/pdf/products/archive/2012/macmini_oct2012.pdf the Mini should use under 1.5W in sleep, yet this one uses 15W.
After rebooting the device will sleep at 3W, but as soon as any user account is logs in, the minimum sleep draw seems to be 13W, with 15W typical. All figures are measured with a Kill-A-Watt EZ. This is a quad core 2012 model.
$ pmset -g Active Profiles: AC Power -1* Currently in use: standby 1 Sleep On Power Button 1 womp 0 autorestart 0 hibernatefile /var/vm/sleepimage darkwakes 0 networkoversleep 0 disksleep 0 sleep 0 (sleep prevented by coreaudiod) autopoweroffdelay 14400 hibernatemode 0 autopoweroff 1 ttyskeepawake 1 displaysleep 10 standbydelay 4200 $ pmset -g assertions 2015-10-09 22:22:18 -0700 Assertion status system-wide: BackgroundTask 0 ApplePushServiceTask 0 UserIsActive 0 PreventUserIdleDisplaySleep 0 PreventSystemSleep 0 ExternalMedia 0 InternalPreventDisplaySleep 1 PreventUserIdleSystemSleep 0 NetworkClientActive 0 Listed by owning process: pid 54(powerd): [0x0006fef70010029f] 00:06:33 InternalPreventDisplaySleep named: "com.apple.powermanagement.delayDisplayOff" Timeout will fire in 157 secs Action=TimeoutActionTurnOff Kernel Assertions: 0x4=USB id=501 level=255 0x4=USB mod=10/4/15, 8:20 PM description=XHC1 owner=AppleUSBXHCI id=502 level=255 0x4=USB mod=10/9/15, 4:28 PM description=EHC2 owner=AppleUSBEHCI
All tests are done with USB devices other than keyboard/mouse disconnected.
What else can I check?