2010 iMac doesn't turn on after unplugging

Discussion in 'iMac' started by tximacusr, Aug 21, 2014.

  1. tximacusr macrumors member

    Sep 5, 2010
    I have a 2010 iMac 21.5, i5, 3.6 GHz, 4G, 1T.

    When new and the first yr or two, before I would go to bed, I would turn off the power surge protector where the iMac and other hardware was connected. After a few yrs I realized that it would take longer for the iMac to "power up."

    Now, I leave it connected to the power surge protector and on so I won't have to worry about this. I disconnected the iMac this past weekend to clean the room and connected it back on Monday, but it won't turn on now.

    Does it have a "power pack" inside that needs to be "charged" before it can be turned on? What exactly is going on here? Last time it did this it took days before I could turn it on again. Assistance is requested. Thanks!
  2. asriznet macrumors regular

    Dec 21, 2013
    an SMC Reset usually fixes power related issues unless there's a hardware fault, you will need to bring in to a service center for them to check.

    Good luck!

  3. macthefork macrumors 6502

    Feb 2, 2013
    It does have a PRAM battery that holds some settings when power is disconnected. If you disconnected it for years every night, it's a good possibility that this battery needs to be replaced. You can look up your exact model to see which battery it is. And yes, a failed battery can cause some strange starting problems.

    Unfortunately, the iMac screen has to be removed to replace this battery, since it's usually located on the Logic board.

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