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Modello A1312 / metà 2011 / Processore Core i5 da 2,7 e 3,1 GHz o Core i7 da 3,4 GHz, ID iMac12,2

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Grey Screen after Password

I’m trying to fix an old iMac that suffered from a regularly appearing black screen problem: after some hours the display would shut off.

So far, I diagnosed that one issue was a defect HDD fan, and I replaced it. After I took it apart and put it together, the iMac shortly worked , but then had the same problem again after a period of 1-2 hours.

Now, it completely fails to boot and just shows a grey screen after the password entry. The same happens when I try to enter the local or internet recovery modes. However, the hardware test is functioning normal and does not find any issues.

As the iMac had a black screen issue before, I’m inclined to think that the graphics card was the issue all along and now gives up entirely as soon as the iMac requires some more intensive work to be done (such as drawing the normal UI). Another option would be that I messed something up during my repair work of the HDD fan and now I’m looking at two hardware problems.

What is my best guess here? Could the grey issue arise from a defect graphics card? Or is a symptom for another well-known issue?

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Lets see if we can focus the problem down. Are you able to boot your system in Target Disk Mode? We don’t really need to plug your system into another system for this test as we only want to see if the display is able to show the FireWire / Thunderbolt icon floating around. Does it?

Reference: Mac startup key combinations

Let it run this way does it stay working?

If so the systems graphics card has failed. What is happening is the CPU’s intergraded graphics services are kicking in and giving you the display of the icon’s unlike before.

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Thank you!

Yes, this works. I can see the floating icons on the screen. So this means the graphics card has failed?

I read that baking the card could work. So my next step would be to try to take the card out, remove all thermal paste etc. and bake it for 15 minutes, just to check if I can revive it. Does anything speak against that?

If the baking fails, I’ll look out on ebay for replacement cards, which seem to be pretty expensive, still.

da

It's only a band-aid and not a real repair ;-{ Replacing the card is the better solution with a new one!

Whats your plan moving forward are you thinking on getting a new system soon?

I still think this is the best built iMac! Upgradable & replaceable RAM & Drive's. It even has the ability to support three SATA drives SSD, HDD & optical without giving up anything! If you really want still more you could even swap out the optical drive to a third drive.

While not as fast as some of the newer systems for most its more than enough!

da

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