Results 1 to 4 of 4
  1. #1

    Member Since
    Nov 29, 2009
    20" Aluminum iMac - Black screen
    Hey guys, so this is my first post on the forum -- apologies if the format is incorrect.

    20" Aluminum iMac, 2.66 Ghz Intel Core 2 Duo
    4GB memory (came with 2GB and I upgraded it myself)
    Running Snow Leopard

    Sometimes when I am exiting out of a program (iChat, Firefox, Adium, Microsoft Word)... my screen turns black (can see that it is still illuminated, the screen is still obviously on).

    There is no way for me to get my screen back, and if I press the power button on the back of the computer it puts it to sleep or something (does not turn the computer off). The only way for me to get my screen back is by turning off my power bar and rebooting.

    This was happening before I upgraded my memory, and it happens 2 - 4 times a week. I am wondering if my iMac is overheating, it gets up to maybe 45C sometimes.

    Any ideas?


  2. #2

    Member Since
    Nov 24, 2009
    heres a try...
    When the ma powers on and you hear the sound, hold the following keys down


    If you still get problems after that, insert the snow leopard disk taht came with the mac

    After you hear the startup sound hold down the following keys


    This should start the apple diagnostic tests to see exactly what is wrong with the computer

  3. #3

    Member Since
    Nov 23, 2009
    27imac i7 8gig 4850, 2x24 imacs 4gig gt130, 15inch MBP 4gig 9600m, iphone, 3g,3gs,itouch
    45 degrees C, is nice and cool for the cpu, it isn't even close to overheating.
    iMac 27 i7, 8gig, 4850, 2x24 4gig, gt130, 15MPB 4gig, 9600m, iphone, 3g, 3gs, itouch

  4. #4

    Member Since
    May 15, 2008
    Jawad Mir
    Editor . Director
    5D Mark II-AF100 & Mac Book Pro & Mac Pro

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. APPLE 17" IMAC G4 Black screen after update
    By sylvaing in forum OS X - Operating System
    Replies: 2
    Last Post: 07-07-2015, 09:55 PM
  2. Windows 7 on 27" iMac : Black Screen
    By Ragna in forum Running Windows (or anything else) on your Mac
    Replies: 16
    Last Post: 07-28-2012, 06:04 PM
  3. Pentium iMac 21.5" starts up but screen is black
    By timothye in forum Apple Desktops
    Replies: 1
    Last Post: 10-13-2011, 01:57 PM
  4. Windows 7 + Imac "27 = another problem than the black screen
    By charmmykitty in forum Running Windows (or anything else) on your Mac
    Replies: 3
    Last Post: 01-22-2010, 04:55 PM
  5. 24" aluminum imac screen flicker
    By yournamehere004 in forum Apple Desktops
    Replies: 1
    Last Post: 07-28-2009, 06:52 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts