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

481 Questions View all

Has my iMac a faulty GPU?

Hey out there,

I recently bought a 27" iMac for about 330€. Works quite well but unfortunately I had some troubles with installing Sierra on it. I had to restart the computer several times to get to the installer - the screen stayed black or white and sometimes it even get blue with black lines.

As I finally managed to get Sierra on the hard drive the computer worked well. But after several minutes/hours the computer restarts randomly.

After some research I found out that this computer model (i5 3.1GHz, serial number) had kind of a recall by apple. As we all know this recall expired.

Are my described symptoms a signal for a faulty GPU? Beside this can anyone tell me what exactly was the problem with this GPU?


Furthermore, can I replace the Radeon 6970 only with original apple parts or can I achieve, somehow, to get a good replacement with an Alienware 6970 card?


Update (01/28/2018)

Well, in the mean time, the computer decided to fail every single boot attempt with showing a blank screen.

At least the apple shows up and the bar goes about the half.

Answered! View the answer I have this problem too

Is this a good question?

Score 0
Add a comment

Free shipping on all orders over $100 or containing a Pro Tech Toolkit!

Browse Our Store

1 Answer

Chosen Solution

First see if it was among the machine in 2011 with known issues by checking your serial number with the ones listed here:


I've been about 70% successful doing a hot air reflow of the GPUs on this model.

Was this answer helpful?

Score 1


Already done so. The end of my serial number matches one entry of the listed ones.


Add a comment

Add your answer

Johannes will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 11

Past 30 Days: 54

All Time: 624