Pattern on the display
I have this patern on the display of a 2008 iMac
I am between the LCD or graphics board
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That’s definitely the GPU board. Failing GPUs tend to make pretty patterns like that.
Please confirm your iMac’s EMC number so we can find you the proper part.
How do I find my iMac’s EMC number?
Update (11/21/2018)
Perfect! Here is a link to a replacement GPU and here is a link to a tutorial on how to replace the GPU.
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The EMC is 2211
@tom084 the guide I included should work for your Mac, tell me if it's not remotely the same and I'll go searching for a different guide.
