Weird Start Up Screen

Hi. Ok, got an oldish imac, and for last 2 years it's been useless, finally decided to look into repairing it.
Used to have the good old blue screen of death, and wouldn't run in safe mode. A friend installed his version of OS snow leopard on it, and we can run it in safe mode fine, and now once it gets past the start up screen, we get a white screen, with a sort of check board line running down the middle...
Snapped this.
We want the kids to have the machine.
Help please!!!

nicholasflack wrote:
Hi. Ok, got an oldish imac, and for last 2 years it's been useless, finally decided to look into repairing it.
Used to have the good old blue screen of death, and wouldn't run in safe mode. A friend installed his version of OS snow leopard on it, and we can run it in safe mode fine, and now once it gets past the start up screen, we get a white screen, with a sort of check board line running down the middle...
Snapped this.
We want the kids to have the machine.
Help please!!!
This looks like a logic board problem, specifically a bad GPU. I don't know what to say, you'll need to find an Apple Certified Service Provider to have them check it out.

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