I just bought my dad a brand new iMac. His old computer was a Mac Mini. And it never slept either. Obviously the migration assistant brought over some bad preferences. BUT how do I fix this issue?! It doesn't sleep AND the screen doesnt even sleep. So it stays up 24 hours a day. Which burns electricity and kills the screen probably. The energy prefs are set to their defaults. Any ideas?
Is there a system wide preference I can delete???
Not a fix for why the Mac won't sleep, but a workround is PleaseSleep. When I had my previous Mac I had the same problem and this free utility worked a charm:
anyone else have a solution?
You may find something helpful here.
It could be anything from software, something that was migrated in, some sharing preference or any number of externally connected devices.
Visit > Mac OS X: Why your Mac might not sleep or stay in sleep mode and work thru all the steps to see if anything shakes out.
Try to delete the following preferences:
/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
/Users/UserName/Library/Preferences/com.apple.systemuiserver.plist
Restart immediately after deleting these files.
Note that the easier way to get to your Library folder under the username is to hold down the option key while in finder and clicking on the "Go" menu and clicking "Library"
What happens if you try to put it to sleep manually?
Thanks guys .... when I put the computer to sleep manually it does sleep .... but it always ends up waking itself somehow. Not sure what it is ... gonna try and get on the phone with Apple Care tomorrow ...
I'll try the preference delete now though ...
>Kills the screen
At least set the display to sleep when it wakes up. Not sure if it still works with Lion, but try CMD-Shift-Eject
Check your energy preferences after deleting those plists and if your Mac is connected via a wired Ethernet make sure that "Wake on Network Access" is not enabled. Also, if you have printers or other peripherals connected to your Mac, try disconnecting them to see if the issue continues. Next consider Bluetooth devices that might be waking the computer. You can just turn Bluetooth off to troubleshoot that.
Cheers,
Jon
Brand new iMac not sleeping ...
