10.7.4 Imac Won't Go To Sleep
Posted 18 May 2012 - 01:41 PM
I've reinstalled Lion but the problem remains.
I've carefully gone through all things on and impacting on my computer that might affect this function both collectively and individually but this process made no difference to the problem.
I've had lengthy discussions with the Apple support community without success (please see
I've sought help through Apple Bug Reporter but nil response.
Does anyone out there have a fix?
Posted 18 May 2012 - 03:43 PM
It was something to do with altering the options, from memory.
Sorry I can't be more helpful, but if you have no luck, you could try googling the Leopard problem.
Posted 18 May 2012 - 04:55 PM
Posted 18 May 2012 - 06:09 PM
Thanks. I've tried this but the problem remains.
Posted 18 May 2012 - 08:11 PM
Posted 18 May 2012 - 09:43 PM
Posted 22 June 2012 - 10:28 PM
It can come down to many things: 'stuck' or 'stubborn' preferences which are not changing properly through display and sleep/wake options which can affect the firmware and hardware, firewalls/antivirus software believe it or not can prohibit sleep mode and also 3rd-party kernel extensions.
We could already eliminate 3rd-party kernels and firewalls/antivirus software because you've tried Safe Boot.
This could be an issue with stubborn preferences; best way to check this is to make a Time Machine backup first.
1. Open Finder and goto the following directory: /Macintosh HD/Library/Preferences/SystemConfiguration/
2. Inside this folder remove the "com.apple.PowerManagement.plist"
3. Restart your computer and Reset the PRAM (CMD + OPT + P & R)
4. After restarting, your Mac will generate a new com.apple.PowerManagement.plist
Check to see if the same thing happens afterwards.
If the same thing happens, it might be handy to check the integrity of the OS by installing the OS on an External HD then booting up to the External HD. It's going to be using the same hardware as the Mac, so if the same issue occurs then you could be dealing with a hardware issue.
Posted 23 June 2012 - 01:06 PM
Welcome to the forum, and feel free to give Ken a hard time, he's a smart cookie, and you can see from his postings he hasn't a life..