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Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Screen scrambled and freezing up during bootup (no hardware issue)

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When I bootup my iMac I get a scrambled screen and after a few seconds the screen freezes.

At first I thought this was a hardware issue but after reinstalling the OSX on a USB drive the OSX booted up normally. I cloned the defceted partition, reinstalled it and everything is working. The cloned one on the USB drive is still scrambled during boot.

Although I have my data there are a few programs I cannot get back so I would like to get this issue resolved. Doies anyone have any advice?

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Have you tried running first aid for the disk that is causing the issues?

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This machine has daughter board video card that be changed.

Here’s the part:

iMac Intel 20" EMC 2210 & 2133 Graphics Card

Here’s how to do it:

iMac Intel 20" EMC 2133 and 2210 Video Card Replacement

iMac Intel 20" EMC 2210 & 2133 Graphics Cardの画像

製品

iMac Intel 20" EMC 2210 & 2133 Graphics Card

$52.99

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@mayer I stand corrected!

I looked up the P/N and I guess I put in the wrong #

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Hi Mayer,

Thanks fro the reply. Same rpely as Dan's. It is not an hardware issue. See updated image on post.

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Well, that's a first. Run a virus scan on the cloned drive,

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Screen artifacts like what your second image shows is a sign the graphics VRAM is failing. Your system uses an integrated GPU chip on the logic board with its VRAM.

Sadly you’ll need to replace the GPU board to fix this. Given the systems age and this is the last year for security support for El Capitan 10.11.x and Yosemite 10.10.x was last year. You should at least get to El Capitan. Or, think at looking for a newer system.

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Hello Dan,

Thanks for replying, but it is not an hardware issue. I cloned the boot partition and reinstalled this partition (see update image of post). The reinstalled partition gives no video errors. Booting from the cloned drive produces the error.

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Then you drive had an OS corruption which you have solved

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Ratskoor さん、ありがとうございました！
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