9 Replies Latest reply: Oct 15, 2012 5:12 PM by Gregory Kane
chuckepoo Level 1 Level 1

After installing Mountain Lion in my Mac Pro it won't wake up after long periods of sleep. I have tried unplugging it for 15 seconds and plugging it back in and starting it back up. No help. I've reset the Pram with no change.


Mac Pro, OS X Mountain Lion (10.8.1)
  • Tony Barone Level 2 Level 2

    I have an early 2008 Mac Pro, it's crashing and/or won't wake up from sleep since installing Mountain Lion.


    At first it wouldn't go into deep sleep at all, now with 10.8.2 deep sleep works again but it won't wake up!

  • Goofyfaces Level 1 Level 1

    I am having the same issue on my iMac. I have to restart it each morning because it will not wake up.

  • Tony Barone Level 2 Level 2

    For me it seems to happen mainly if I have iTunes open when it goes to sleep.

  • Coxize Level 1 Level 1

    I have the same issue. 2009 MP Quad 266.

    A short sleep-10-30 minutes it will wake fine. Longer than that and the power light is no longer pulsing, the screen stays black, no activity. Have to do a hard shut down.

    I am going back to 10.8.1

    seems like Apple is getting more like MS every OS rev. I mean heck look at the icons ion this message bar! Looks like Chrome. UGH

  • DogBone384 Level 1 Level 1

    Same issue with my Mid 2009 17" MBP.  I just disabled wake on LAN, so we'll see what happens in the morning. Also had issue with Time machine stalling out.  Was on phone with Apple support for 1 1/2 hours without success.  They claimed to be unaware of my latter problem as I read them a post from page 6 of 16 of this forum.

    I ended up fixing it myself by deleting the last partial backup I found on my Time Machine disc.


    Any more problems and I'm going back to 10.7 - I agree with many that Apple is getting much like Windows with each OS 'upgrade'.  Maybe I'll try giving 10.8.2 my cat's worm medicine....

  • Gregory Kane Level 1 Level 1

    Early 2009 MacPro with dual displays.  SINCE 10.8.2 update. . . will not wake up after sleep . . .   sends aperture and itunes into a tizzy each time i have to power the mac off manually.  Not fun or comforting.

  • Gregory Kane Level 1 Level 1

    Two calls into tech support, but I think they may have helped me fix this.








    remove any third party software and set aside.  (they told me I could keep some adobe, microsoft and HP items)




    System Preferences --> Users + Groups -->Login Items


    remove any third party stuff from in there.



    I'll know tomorrow morning if this REALLY works, but it dfefinitely allowed my computer to sleep and wakeup over a short period of time.

  • Kurtz25 Level 1 Level 1

    Me too. Mac Pro 3,1 (early 2008). Just the same as what everyone is describing. It goes to sleep and never wakes back up.

  • Gregory Kane Level 1 Level 1

    Alright - regarding my previous post of cleaning out launch agents - none of it actually mattered.


    After cleaning the launch agents and startup the computer allowed itself to go to sleep from the apple menu, but not on it's own.  THAT was actually the problem - it would never GO to sleep - and once displays were down - game over. 


    Final answer, after about 6 calls to applecare:


    boot to recovery disk by holding down option key

    reinstall 10.8 (which actually installs 10.8.2)


    stuff seems to be working as it should now.