iMac freezes after lion upgrade

Question

iMac freezes after lion upgrade

Upgraded imac from SL to lion, and now the computer freezes when waking from sleep or switching accounts. I have no issues during the process of using the computer. I have installed new RAM (4gigs), reinstalled the OS, erased the HD (securely) and rebuilt from back-up, pram, disk utilities, disk warrior. Read in one post that this may be the logic board and that Apple may be replacing these in certain modles. I never had the computer freeze when I was running SL, and I am a school IT guy with over 100 macs running SL and this does not happen at school. I have heard from others of the same thing once they go to Lion but the Apple Store says they have not heard of it! Do not see how this could be a hardware thing since it looks to happen after Lion upgrade.

Any ideas

iMac, Mac OS X (10.7.2), late 2007 model

Posted on Dec 8, 2011 5:44 AM

Reply

Answer 1

Best reply

Arlene Siegwarth

Level 1

10 points

Feb 4, 2012 10:35 AM in response to mattfromsaint michael

This was happening to me too. It was suggested that I go to energy saver in system preferences and set the computer to never sleep. That seems to have worked for me.

Reply

Answer 2

Feb 4, 2012 6:44 PM in response to Arlene Siegwarth

I did do the above as I read that may work too, I also made it so the HD never sleeps. Did not help for me, computer still freezes when switching accounts, not all the time, on average every other day I need to do a hard restart.

Still looking for the answer

Reply

Answer 3

HACKINT0SH

Level 5

5,810 points

Feb 5, 2012 5:10 PM in response to mattfromsaint michael

I do know that switching accounts isn't advisable, because the resources need to keep track of the in-active accounts, despite they are not even being used.

Reply

Answer 4

Feb 5, 2012 5:36 PM in response to mattfromsaint michael

I found that unplugging from the power adaptor worked for me. I can't figure why it happens, but if i either unplug adaptor befor sleeping or at time of waking then it doesn't freeze

Reply

Answer 5

Feb 7, 2012 8:29 AM in response to waldhaus1

Interestingly since going from 10.7.2 to 10.7.3 the problem has gone away. I can now sleep the Mac Book Pro by closing the cover even if power is connected.

Reply

Answer 6

Feb 7, 2012 8:34 AM in response to waldhaus1

I did run this update this morning before I left for work, I am curious to see if this will fix the issue. I know the last system update fixed a similiar issue on newer iMacs.

Reply