Suspect graphics card failure = pixel pattern on screen display

I am vainly hoping that it is not the case but I stongly suspect that the graphic card/chip is failing (on logic board).

- machine operates fine

- screen is distorted with regular patterned 'tramlines' running vertically. Desktop is virtually illegible as a result.

- same distortion occurs when plugging in an external monitor

I;m hoping that this my be a symptom of a loose connection btween the screen and graphic card. But I'm thinking not.

Greatly appreciate your input.

Answered! View the answer I have this problem too

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Since the problem persists on an external monitor that rules out the cables and LCD. Sounds like a GPU (graphics card) failure. Here's your choice of logic boards:

or repair service:

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Thank you Mayer. That's what I thought.

Sadly $450 and out of stock. Does't look like this Mac will get much more use!


Or maybe not:


The eBay unit looks very good.


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James Clark will be eternally grateful.
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