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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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iMac wont install even in recovery mode.

So i recently replaced my PSU en HDD of my 27 inch imac recently. I replaced the PSU because it wouldn’t turn on anymore and the HDD because my old one died. It is a verified apple HDD with temp sensor so all good there. But once i try to install anything it will get past the loading bar and than a white screen and… nothing. Just a permenant white screen. Until about 30 min later when is flickers and turns off.

Any help would be aprieciated,

kind regards

Update (06/11/2019)

Thanks already to everybody who helped.

I tried the Linux LIVE USB and I think I can safely say the GPU is defective.

It does load the linux OS fine at first. I get a visual interface and right about when the resolution changes to the native resolution the background turns black and graphical glitches show up.

Also the screen kinda went on and off from time to time? Is this like a driver install thing? Anyway I can’t click anything in Linux though.

I can move the glitched cursor but nothing else. So it is safe to say it is the GPU?

Beantwoord! Bekijk het antwoord Dit probleem heb ik ook

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Try booting from an external USB drive with a known good system on it and let us know your results.

Does the last four figures of your serial number (found on the bottom of the stand) match one of these?

DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8

DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610

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@mayer - The GPU recall has long since ended. But it's possible I guess.

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@danj I understand that but it doesn't stop them from failing and these are the ones most likely to fail.

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I will try that. Should I try linux or something else?

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The linux live USB resulted in graphical glitches and no response in after a while. Can i confirm the GPU is fried?

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Outer Is sure looks like it to me.

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Sadly it sounds like your system got hit by a surge or lightning strike.

Thats why your power supply went and your logic board also got nailed as well.

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How can i know for sure the motherboard is defective. It seems to work fine. (wifi, ethernet, all that works.) the self test from apple also found nothing and i suspect the gpu. Because when a gui is loaded in the white screen apears.

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Alright. For anyone that still c ares. It suddenly stopped working. But now i cant even boot into linux since the screen will become black. There is nothing on screen. The HDD is still clicking and the fans are still spinning but nothing happens. I will probably try a gpu reflow since it is my last option.

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Outerspace zal eeuwig dankbaar zijn.
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