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Model A1311 / Late 2009 / 3.06 or 3.33 GHz Core 2 Duo processor

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My iMac Late 2009 Display, flickering, dimming, and pixelated

Display has been flickering and dimming during startup for a while now, didn't really bother me, until I upgraded the hard drive to an SSD. Then the display started to become pixelated. I have already connected the iMac to an external monitor and the problem does not transfer to the external monitor. Attached is a picture how it currently looks. Not sure if the picture shows the extent of how pixelated and oversaturated the colors look. Any help will be greatly appreciated thanks.

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Hook it up to an external monitor to help isolate the problem. If the issue persists you will need to replace or reflow the GPU.

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I've hooked it up to an external monitor and the external monitor looks fine, which leads me to believe that the display or connectors are faulty.

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Hello Alex,

I can almost guarantee it is not the SSD that is causing the issue. That should speed up the laptop if anything. Although, I did some research and found an answer to this question previously. Because I don’t intend or care to take credit for their knowledge, here is the post that was solved with a person having the same issue: Scramble/Pixelated then flickering screen..

Best of luck!

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Thanks for the reply but I don’t believe that’s the solution. I did minor reaseach on the Nividia settlement and it looks like laptops were the only ones affected. This problem is happening to a late 2009 iMac I’ll take a better picture of the problem because I just checked through my iPhone that the picture I posted through the iMac shows the screen normal.

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I have an late 2009 iMAC 27inch. Have similar issue with screen. I post it the image. Does anyone see this problem before? I ran hardware test showing 4hdd/11/40000000:sata(0,0). I am not sure if this hard drive code correlate with a screen problem. Any thoughts on this?

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I also want to add that when I run the iMAC in safe mode, the screen looks fine.

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Alex Suarez zal eeuwig dankbaar zijn.
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