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My iMac 27" screen won't come on after sleep mode,

214 Views 3 Replies Latest reply: Dec 20, 2012 11:15 AM by pkjok3r RSS
billyrollo Calculating status...
Currently Being Moderated
Dec 19, 2012 3:57 PM

the fan comes on really loud and just stays running with no screen start. I have turned it off and switched the plug off for the night and come back in the morning and it boots up fine... But then it goes to sleep and the same thing happens again?


I also recently updated the lion OS to the latest version available?


Please help...

iMac, OS X Mountain Lion (10.8.1)
  • pkjok3r Calculating status...

    Go into energ saver in system preferences, set the disply to go to sleep at whatever time you prefer. Set the computer to go to sleep about 1 minute later. Nine times out of ten this resolves this issue.




    <edited by host>

  • pkjok3r Level 1 Level 1 (30 points)
    Currently Being Moderated
    Dec 20, 2012 11:15 AM (in response to billyrollo)

    I would try doing an SMC and PRAm reset, if that doesn't work then see if it woll allow you to boot into recovery, once there verify disk permissions/repair disk permissions. If the problem presists from there re-install OS Lion (assuming you were able to get to the recovery partition.


    SMC reset:

    Shut off machine > Pull out the power cord from the back of the mac > While the cord is removed hold down the power button for 15 seconds > plug the cord back in and proceed to boot


    PRAM reset:

    Hold down Command + Option + P + R > trun on the computer and continue holding those keys down until you hear the startup chime 2-3 times


    Recovery partition:

    In order to boot to the recovery partition hold down the option key at startup, a screen should appear that has Mac HD and Recovery, go into recovery. From there select disk utility and this will allow you to perform first aid (I.E. repair disk, verify permissions, repair permissions)

    If that does not work, again boot to recovery and select "reinstall Mac OS X"


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