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iMac (2011) no longer goes to sleep since upgrading to Mountain Lion

124 Views 1 Reply Latest reply: Aug 3, 2012 10:40 PM by DJChad RSS
AndrewC1970 Level 1 Level 1 (15 points)
Currently Being Moderated
Jul 27, 2012 1:38 PM

Hi All,


Since upgrading to Mountain Lion, my iMac (2011) no longer automatically goes to sleep when left inactive for a period of time.


When I force the iMac to sleep, it wakes up again a few minutes leter.  Prior to the upgrade it would sleep fine (and I have not changed any settings etc).


Another issue (which could be related).  Since upgrading to Mountain Lion my Western Digital Hard Drive (which I use for my Time Machine backups) seems to unmount after a period of time.  The drive is still attached and I can manually remount the drive using Disk Utility but after a period of time the drive unmounts itself.


There is no error message though (so it does not think it was an unsafe mount).

iMac, Mac OS X (10.7.1)
  • DJChad Level 1 Level 1 (0 points)

    Having same problem.  WD Studio 3TB.  Its my iTunes media drive.  My Time Machine is a Lacie Network drive and stays connected for TM.  However my Superdrive will constantly spit put DVDs when I load them. 


    Something is definitely wrong.  2010 imac 27" QC i7 here.  Ive been working with Apple.  I have more to report to them tomorrow.  So we will see what happens. 


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