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Join Date: Aug 2011
Re: iMac is not coming back from sleep ever since I installed OS X Lion.
I have had the same problem and I have managed to clear it out without the use of the above instructions. This does not imply that the above solution is worthless and I do not intend to offend anyone. But I just wish to post the solution that I discovered for the issue only with an aim of helping those in need. I happened to resolve my issue using the System Management Controller (SMC) it is also called Power Management Unit following the below mentioned steps and instructions:
Before you go ahead with the resetting process, I would ask you to follow the below given steps.
- In order to force quit all the applications which are responding you need to press Command + Option +Escape
- Go to the upper-left menu bar to find the Apple menu, choose Sleep from there and put your system to sleep.
- Restart your system by going to the upper-left menu bar to find the Apple menu and pressing the restart button
- Again from the same Apple menu, chose the Shut down button in order to shut your PC down
If even after this, you PC just stops responding but keeps running normal, you need to forcefully shut the machine down by pressing and holding the Power Button for 10 seconds. Please note that, if there exists any unsaved data in any open application, they will be lost.
In order to find out if the resetting is actually necessary, you will need to perform the below given checks:
- You will have to try unplugging the MagSafe adapter for a few seconds from both the Mac PC and the power socket
- After confirming that the PC is completely shut down and there is no power supply in the system, actually remove the battery and put it back and start the Mac.
In case you happen to realize the issue is still not resolved after following the troubleshooting mentioned above, an SMC reset looks unavoidable
Still, if the following conditions are true in your case, you can confirm that the SMC reset is necessary for your system
o The fans installed in your system, run at an unusual high speed which looks and sounds different without much diagnosis- Lights
o If you notice that the keyboard backlight is not behaving as it is supposed to be.- Power
o Even the status indicator lights, apart from battery indicator and display backlight all behave unusually weird.
o Even when the computer’s power button is pressed, it doesn’t respond at all.- System Performance
o It doesn’t wish to respond when you happen to close or open the lid in case of a portable Mac.
o There is an unexpected and high number of shut downs and sleeps which leads to unbelievable troubles
o There is no proper charge in the battery and sometime the system refuses to respond to the charger
o Activities In the system is not tracked and indicated correctly by the MagSafe power adaptor LED.
o The CPU utilization is moderately low, still the system seems to run unexpectedly slow.- Video:
o There is no desired and expected switches between target display mode by a computer which supports target display mode
o There is unexpected and unwanted switches between target display mode by a computer which supports target display mode