iMac Continuously Reboots

Discussion in 'Mac Basics and Help' started by gvegastiger, Sep 28, 2009.

  1. gvegastiger macrumors regular

    Joined:
    Oct 4, 2007
    #1
    I need some help. We have an iMac at the office, but I have no idea what the specs are on it. It is an Intel machine and it has the aluminum enclosure with the black backing, probably 2 years old, and its running Leopard.

    It will not boot up (which makes it difficult to know what model it is). It chimes, goes to the gray screen with Apple logo and the spinning wheel starts, and then it shuts off and starts over. Sometimes the spinning wheel starts and sometimes it doesn't before it restarts. The hard disk makes a noise like its starting up and then it stops. It has been doing this for about 1 week now.

    So far I've reset the PRAM and tried to start in safe mode and neither works. Is there anything else I can try or is it borked?
     
  2. gvegastiger thread starter macrumors regular

    Joined:
    Oct 4, 2007
    #3
    I tried resetting the PRAM already. I read that article and tried booting into verbose mode, but it reboots at different times during the boot process.

    I also tried booting into Target mode (not sure what that is exactly) and got a giant icon for Firewire floating around the screen. Does that mean something?
     
  3. davidwarren macrumors 6502a

    Joined:
    Aug 28, 2007
    #4
    that means you booted into target mode. Connect it to another mac with a fw cable if you can.


    edit-- do you have an os disk? try and boot from that.
     
  4. gvegastiger thread starter macrumors regular

    Joined:
    Oct 4, 2007
    #5
    I do have a disk, how exactly do I boot from it. Do I need to hold down a key while its booting?
     
  5. Gregg2 macrumors 603

    Joined:
    May 22, 2008
    Location:
    Milwaukee, WI
  6. JustGretchen macrumors 6502

    Joined:
    Dec 2, 2008
    #7
    if you can boot from an external bootable drive, run a SMART utility on the drive like SMARTctl for Mac to see if there is any pending sectors. May just be a bad drive.
     
  7. gvegastiger thread starter macrumors regular

    Joined:
    Oct 4, 2007
    #8
    So I tried booting it from the install disk and no go. It just spins for a while and then reboots. I'm thinking its got to be the hard disk.

    If theres any other troubleshooting tips you could give me, I'd appreciate it.
     
  8. Gregg2 macrumors 603

    Joined:
    May 22, 2008
    Location:
    Milwaukee, WI
    #9
    Find out if AppleCare was purchased. You might be covered.
     
  9. arjen92 macrumors 65816

    arjen92

    Joined:
    Sep 9, 2008
    Location:
    Below sea level
    #10
    I recognize your problem. I had the same problem. At the end the hard drive died. We got the imac checked and repaired. They also replaced the power supplier (I don't know the english word, but it's the thing that divides the electricity for all the part in your pc).

    I don't say it's that electricity divider thing, but I'm quite sure that your hard drive is dead. You should prepare yourself to never see it working again. I hope you have back-up.

    (if there is vital information on the disk you can let it checked by a special company, but I think it's not worth that, prices go high to 100-200$ minimum).
     
  10. CubeHacker macrumors 65816

    CubeHacker

    Joined:
    Apr 22, 2003
    #11
    A dead hard drive would not cause the iMac to just reboot - especially if you are booting from a CD/DVD disc. Either there is some kind of contact issue with the power button, or there is a problem with the power supply or logic board.
     

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