24" iMac won't turn on after power failure overnight

Discussion in 'iMac' started by Playgear, Aug 6, 2010.

  1. Playgear macrumors regular

    Apr 10, 2010
    Hey all,

    Just before I start, my AppleCare ran out earlier this year in February, so I'd rather not have to take it in the Apple if I can avoid it.

    So, I left my iMac on overnight last night to finish downloading some stuff.
    I woke up and all our clocks are flashing, so we must've had a blackout.
    Anyway, I went to check the progress of my downloads, and the iMac was off.
    I pushed the power button and nothing happened. No fan noise, HDD noise, nothing. I've been trying for almost two hours now and nothing is working.

    I've already tried resetting the SMC and checking the RAM modules, which seem to be fine. I can't try anything else (ie resetting PRAM) because it won't turn on to boot. Nothing happens.

    Can anyone offer any advice?

  2. LoneRider macrumors member

    Aug 6, 2010
    Lake Stevens WA
    I am new to Macs, but my PC experience is if there is nothing at all when you hit the button, no sound, fans, etc. it is most likely a blown power supply.

    I am assuming you checked your breaker and any power strip breaker? Did you have it on a surge protector or (better yet) a UPS?
  3. Darth.Titan macrumors 68030


    Oct 31, 2007
    Austin, TX
    Sounds like you might have suffered more than a garden variety power outage. A power surge might have cooked your power supply.

    Do you use a good surge protector? Cheap ones offer little, if any, protection.
    I'm sorry for your misfortune, but your homeowner's insurance might be able to help.
  4. Vylen macrumors 65816

    Jun 3, 2010
    Sydney, Australia
    If you didn't have a surge protector, then chances are you killed the power supply and you need it replaced by Apple and fork over some cash.

    If you did have a surge protector, there's a slim chance your power supply was killed but assuming you have a good protector (e.g. Belkin), they'll cover the cost of damage/repairs so get into contact with them - since they always offer a lifetime damage insurance thing.
  5. Playgear thread starter macrumors regular

    Apr 10, 2010
    Did have surge protection. Turns out that the iMac itself tripped the upstairs power circuit. So I guess the power supply is dead and I'm off to the genius bar to have it repaired.

    Thanks anyway everyone!
  6. megap macrumors newbie

    Jun 1, 2012
    Try a hard reset

    This has happened to me twice in the past week, seeing as we have had some pretty nasty storms. The second time, I even shut down our Mac when I heard the storm starting, but we still had the same problem the next morning after a power outage.

    The solution ? I unplugged the Mac from behind the screen, not the outlet end. I left it unplugged for about 30 minutes. After I plugged it back in, it started like a Ferrari. Happened twice and worked twice.

    Good luck.
  7. Chrisg2014 macrumors regular

    Aug 23, 2010
    did you try a new outlet? If not its your power cord. Try and order a new one off amazon, it that doesn't work. Your going to have to take it to a professional. It doesn't have to be apple. Look on Yellow pages or something like that for computer experts
  8. kkbyrns macrumors newbie

    Jun 4, 2012
    Thank you megap!

    This solved my problem! I'm so relieved. Thank you! :D

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