10 Replies Latest reply: Jun 1, 2012 9:08 PM by FolsomDan
Jalthammar Level 1 Level 1 (0 points)

When i press the powerbutton on my iMac i can hear the computer start, but the screen is black as if it was off and it wont break a sound from OSX.

Its like its in sleeping mode and wont wake up.


I shut the computer off yesterday and then it worked as usual. Anyone know what could have caused this or how to solve it?

Really need this fixed, got loads of papers to hand in so im in a tight spot!

iMac, Mac OS X (10.6.8)
  • 1. Re: iMac wont start.
    mcbuffy Level 4 Level 4 (1,050 points)



    It can be a software or hardware problem (especially the RAM).

    You can try to start your iMac in Safe Mode (it takes longer than a normal startup).

    1. Press the power button.
    2. Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
    3. Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).


    If that works check your hard drive and repair the permissions with Disk Utility. Do a backup with Time Machine (or another application).

  • 2. Re: iMac wont start.
    Paul_31 Level 6 Level 6 (12,780 points)

    You could try an SMC reset:


    1. Shut down the computer.
    2. Unplug the computer's power cord and disconnect attached devices.
    3. Wait fifteen seconds.
    4. Attach the computer's power cord.
    5. Wait five seconds, then press the power button to turn on the computer.
  • 3. Re: iMac wont start.
    Jalthammar Level 1 Level 1 (0 points)

    Thanks for the help. Does not work:(


    I dont get a startup tone,(nothing happens) and when i try SMC reset the computer fans goes crazy and nothing happens except that the fans blow. Still black screen.


    I fear that this will be a pricey story!

  • 4. Re: iMac wont start.
    Carolyn Samit Level 10 Level 10 (89,725 points)



    If you don't hear the startup chord that means your Mac has not passed it's startup diagnostics. You need to take your Mac to an Apple Store or Apple certified repair provider.


    You can make an appointment at an Apple Store Genius Bar in advance >  Apple Retail Store - Genius Bar

  • 5. Re: iMac wont start.
    Nicks Toes Level 1 Level 1 (0 points)

    Dont waste your time (and money) at Apple genius. They cannot fix this. I have just been thru all this.


    Suggest look for a new machine.

  • 6. Re: iMac wont start.
    FolsomDan Level 1 Level 1 (0 points)

    I am having this exact same problem.  iMac tries to start - then freezes like it's asleep.  Fans continue running.  2.66 GHz intel Core 2 Duo machine.  I've got an appointment today at the Genius Bar - I want to at least explore a fix before I replace it.  As luck would have it - I purchased and installed a Time Capsule a few weeks ago - so the machine was backed up completely before it took a dive.  With 11,000 or so pictures and tons of music on the computer - the back up was one of my top purchases for the computer . . .


    I'll report back when and if I get an answer

  • 7. Re: iMac wont start.
    mcbuffy Level 4 Level 4 (1,050 points)



    FolsomDan, did you try the two solution suggested above (restart in Safe Mode and reset the SMC) ?


    You can also restore your computer's firmware back to factory condition. Follow the directions to restore your firmware. If you take your computer to an Apple Store they can do that.

    Hope this will help.

  • 8. Re: iMac wont start.
    Jalthammar Level 1 Level 1 (0 points)

    Hi everyone! I handed my computer to a retailer and expect to get it back tomorrow. The problem for me was the graphics card that had broken down.


    Dont know how it just can "break" from one day to another. Hasnt been to warm and the computer has not taken any hits but, i guess i can just give up! Didnt cost to much to replace luckily.


    Well that fixed my problems anyways. Hope its helpfull

  • 9. Re: iMac wont start.
    FolsomDan Level 1 Level 1 (0 points)

    Yes - I tried these solutions to no avail. Took it to the genius bar today - same result. They expect a logic board failure. I've been reading up on this - and it appears that iMacs of this vintage (2008) have a history of logic board failures.


    They're going to run further diagnostics on it to confirm. It could be the ram - but I should still get the chime with bad ram. It'll be a $500 plus fix if it's the logic board.


    Not sure if I'm going to get it fixed if it's the logic board - might just replace it with a MacBook air - maybe another iMac.


    Ugh. These units are supposed to be higher quality than the "rest" of the field. Very disappointing.

  • 10. Re: iMac wont start.
    FolsomDan Level 1 Level 1 (0 points)

    Well - my logic board was bad. Cost me $550.


    I'm sorry - but the logic board shouldn't fail. Very frustrating.