Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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After power failure, computer will not start up?

After recent power failure, Imac will not stat up. No sound or any indications. Tried unplugging power cord and re-plugging power cord and depressing the on switch for 10 - 15 seconds, no response. Tried powering from another AC power outlet, no response. Appears power supply has failed. I am prepared to replace power supply but could the problem be something else?


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If you had no (or a cheap) surge protector you could have damaged the power supply. Follow the guide to open the unit then check the iMac won't start, diagnostic LED's checked, what it mean?.

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I have a surge protector, not sure on the quality. I will check the LEDs when I open the unit.

I believe you are right, it is most probably a damaged power supply.

Appreciate your help.


If you're really lucky it might be a fuse... some of the power supplies do have an overload fuse... but if it was a brownout (voltage drop) the fuse doesn't help. That's why a battery back up uninterrupted power source is better than a plain surge protector.


Thanks, opened case and measured power supply output voltages with VOM. Found zero Vdc on all pins except 1.2 Vdc on pin 5 and 3.41 Vdc on pin 9. Replace power supply and restored to operation. Relatively easy using Ifixit tools and guides. I was a bit baffled on how to get the case open until I read Ifixit guide and watch a video on the WWW.

Thanks for your help.


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barbehenn will be eternally grateful.
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