iMac wont boot up

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iMac Intel 27" EMC 2429

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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Mat @snowpike

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Posted: Sep 20, 2017

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iMac wont boot up

iMac 27" Mid 2011 2.7ghz intel i5

EMC 2429 A1312

Hi,

I was on my computer and all of a sudden it shut off. I tried to unplug it plug it back in and waited for a bit, and I still get nothing, it won't boot up whatsoever.

My guess is that the power supply is dead.

I was just wondering what the part number might be.

ALSO, Will a 2009 iMac PSU 614-0476, work with my 2011 iMac?

this is the power supply I found on ebay that I'm thinking of getting

http://www.ebay.ca/itm/Apple-iMac-A1312-...

Thanks!

Answer this question I have this problem too

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4 Comments

Have you checked behind the back cover of the PC? Dust could be an option or a battery.

Sep 20, 2017 by Cody Rutherford

What diagnostic LEDs are you seeing?

Also: Won't power up and only 1 diagnostic LED

Sep 20, 2017 by Steve

ok so, i unplugged it for a bit plugged it back in, it started, then it randomly shut off i tried turning back on it it wouldnt start. so i opened it up and cleaned out the dust, it turned on and it worked again for a couple of hours and then it shut off again. the computer shuts off and you can see everything go to the middle off the screen and then disappear, it wouldnt turn back on. it looks like the power supply might be faulty. whenever you plug it in the wall while its off and listen carefully you can hear a small buzzing noise coming from the PSU

Sep 23, 2017 by Mat

Wondering how this turned out for you, Matt M? Did you keep trying to fix it or is it time for the scrap heap? I find myself in a similar situation. I have not opened mine up, but it has not turned on and won't turn on. I bought a new power cord to see if that was the problem, and it is not.

Mar 29, 2018 by Amy C

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2 Answers

Have you checked behind the back cover of the PC? Dust could be an option or a battery. — Cody Rutherford
What diagnostic LEDs are you seeing?

Also: Won't power up and only 1 diagnostic LED — Steve
ok so, i unplugged it for a bit plugged it back in, it started, then it randomly shut off i tried turning back on it it wouldnt start. so i opened it up and cleaned out the dust, it turned on and it worked again for a couple of hours and then it shut off again. the computer shuts off and you can see everything go to the middle off the screen and then disappear, it wouldnt turn back on. it looks like the power supply might be faulty. whenever you plug it in the wall while its off and listen carefully you can hear a small buzzing noise coming from the PSU — Mat
Wondering how this turned out for you, Matt M? Did you keep trying to fix it or is it time for the scrap heap? I find myself in a similar situation. I have not opened mine up, but it has not turned on and won't turn on. I bought a new power cord to see if that was the problem, and it is not. — Amy C

XTerminal @xterminal Rep: 1.5k 10 9 · Answer 1 · 2017-09-20T20:21:45-07:00

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XTerminal @xterminal

Rep: 1.5k

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Posted: Sep 20, 2017

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Try to disconnect the power cord from the iMac and the wall and hold the power button for 20 seconds to drain any power on the board then plug the power cord back to the iMac and the wall and turn it on. If it doesn't power on. Post your serial number to find it here is the instructions https://support.apple.com/en-us/HT201864 .

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