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It doesn't do it immediately after being turned on, it happens after a while of use. There's no unusual sound like a fan spinning hard and it doesn't seem unusually hot. I've removed the display and re-seated it and made sure all the connects are firmly in place on the motherboard.
I've uploaded a short video here: http://mazz0.com/images/IMG_0673.m4v
And here's a still image:
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Your GPU has failed. Here's how to replace it:
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Hmm, replacement isn't as expensive as I expected. Is it possible to get a higher spec GPU while I'm replacing it?
Your system came in to configurations:
• ATI Radeon HD 4670 (256MB), Apple P/N 661-5539
• ATI Radeon HD 5670 (512MB), Apple P/N 661-5546
Yep, appears it was indeed the graphics card. I've fixed it for now by baking it. From what I've read this is likely to be a temporary solution that may well revert after a few months. Now that I've confirmed the problem, and that I have the ability to replace it, next time it fails I'll look to buy a replacement. Thanks!
What do you mean "baking it"? I bought my son a 2010 imac with a flickering screen. We'd like to try whatever you did and see if its is indeed the GPU.
Tevya Baking it is one of the surest ways to destroy it. You are trying to melt solder and it melts a specific point (which you can see). Think about trying to bake bread and not knowing the temperature or for how long. A reflow can work but you need a hot air work station and an eye for when the solder melts.
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hi I just bout 2017 iMac 27 inch and 1 week into it the left side get "blips" about 2 inches...fist flashes on bottom left, then middle left of screen then upper right of the screen....then the whole screen "flashes" like a photo being taken but flashes black for a nano second. All these "blips" happen for a nano second.....why anyone??
by Maria