iMac Graphic glitch

[SanjeevRana]

i have a mid 2011 iMac which has suddenly started showing graphical glitches and then it hangs and has to be hard rebooted.

It starts in about a few seconds of system boot. I have upgraded RAM in system to 24GB for about 2 years now so I was able to swap and try out ram combinations to rule out any issues there.

Is there hope to get this fixed ? I don’t want to carry my iMac all around the market for 3rd party repair shops.

Screenshot : https://share.icloud.com/photos/0aKOYP0MxRU0LRdhFt6A6YB9A#Changi,_Singapore

video : https://share.icloud.com/photos/07VjA0pyfo6joayi62a6t0ayA#Changi,_Singapore

 

[Razzerman]

Hello there,

It's not great news, but there are quite a few threads on here about this issue. Try this one
or here
I have three of them, and all of them still work after baking the graphics cards (touch wood).

Razzerman

 

[mikehalloran]

The culprit is the spinning hard drive. The GPUs expand and contract which puts a strain on the solder joints over the years. This is why baking the GPU works.

To keep the problem from coming back, get rid of the HDD and replace with an SSD.