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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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27” iMac power supply repair

Mid 2011 27” iMac A1312 EMC 2429 I would leave it in sleep mode. One day I tried to wake it up and everything about the Mac was dead no response. iMac was plugged into surge protected power strip and devices plugged into power strip works fine. Decided power supply in iMac was bad. Ordered new power supply from iFixit P/N: IF174-000-1. Removed iMac front glass and screen noted when replacing power supply that the part shown online visually matches the old power supply in iMac, but new part doesn’t visually match. Double checked part ordered and part received as it relays to computer specs and configuration finding right P/N ordered and received. Thinking new part is third party version went ahead and installed part. After getting iMac reassembled found iMac chimes and starts to boot up, stops then starts chimes and reboot again then boots up. Then login screen comes up. I put password in and desktop is shown for about two minutes then the screen turns off. Durning the two minutes of screen on time the mouse moves put you can not click on anything. You can get the screen to come back on by tapping power button or keyboard but same two minute issue. Any thoughts, any suggestions.

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Apple had two suppliers for power supplies so yours and the replacement could look different so don’t get bent up on that.

Lets see what happens when you boot up under safe mode Shift (⇧) and then given the onboard diagnostics D a try. Restart your system and press USB wired keyboard key when you get the Bong.

Reference: Mac startup key combinations

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macOS has had some hibernation issues in the past so you can try disabling it with a terminal with these commands:

  • sudo pmset standby 0
  • sudo pmset autopoweroff 0

I’ve done a few iMac Power supply replacements and the cables can be quite tough to fully get in. If nothing shows up with the diagnostic mentioned by Dan and the hibernation settings, I would try opening up the iMac again and make sure those cables are plugged in properly or you most likely have a faulty replacement power supply.

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Curt J will be eternally grateful.
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