imac boots with black squares on white screen

Discussion in 'iMac' started by jimbob61, May 26, 2012.

  1. jimbob61 macrumors newbie

    Joined:
    Jul 18, 2010
    #1
    Dear all
    recently my intel iMac 8.1 has been having problems, here's a rundown

    screen would freeze then reboot after cooling down.
    machine would freeze often
    sometime machine would boot up again normally
    machine would always boot up in safe mode.
    sometimes machine would not boot up further than white apple logo.
    top lefthand corner of machine becoming increasingly hot.
    machine will not boot at all in safe mode.
    machine now has a white screen with small black squares on boot up and will go no further.

    Have tried the following remedies
    set up new user account
    repaired permissions on several occasions
    run hardware test from disc showed up error Error on iMac 4mot/1/40000003: HDD - 1340 this suggests a hdd prob.
    reinstalled OS X leopard from original disc then upgraded to snow leopard and then installed lion.
    tried new hard drive

    I have looked at various threads and they suggest hard drive problem to graphics card. I am trying to establish as close as possible what might be the problem. Any help appreciated.

    Many thanks
    jimbob61
     
  2. pintsizemacman macrumors regular

    pintsizemacman

    Joined:
    Sep 26, 2010
    Location:
    ohio
    #2
    Your Graphics is failing... I recommend a low to medium end ATI replacement card (depending on what you are planning to do on the iMac).
     
  3. jimbob61 thread starter macrumors newbie

    Joined:
    Jul 18, 2010
    #3
    many thanks pintsizedmacman for the prompt reply. can you recommend a card and how easy or difficult is it to replace.
     
  4. pintsizemacman macrumors regular

    pintsizemacman

    Joined:
    Sep 26, 2010
    Location:
    ohio
    #4
  5. jimbob61 thread starter macrumors newbie

    Joined:
    Jul 18, 2010
    #5
    the serial number is A1224 & the enc2133

    rgds
    jimbob61
     
  6. JediMeister macrumors 68040

    Joined:
    Oct 9, 2008
    #6
    The serial number is a 11 or 12 digit alphanumeric string, A1224 is not the serial number.
     

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