iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Display shows vertical stribes - what have failed?

I´ve read hours worth of forum posts regarding this and similar issues with the display but still not sure how to proceed.

It shows 5 vertical stribes immediately and after Apple logo it stalls at a white/grey screen.

Can boot in safe mode - stribes still there and depending on the background they can appear green and other colors.

Screenshot does NOT show stribes!

External display WILL show stribes.

iMac used as a display - NO errors on screen.

Those green diagnose led lamps (through vent holes) seems to turn on all 4 of them even though I´m having a hard time being 100% sure of the no 4 led.

Boot from a clean 10.10.2 external HD makes no difference to the above mentioned.

Have pulled out the graphics card and sav a little smudge on the connector pin - cleaned it (with clean air) and reaseambled. Still same problem.

I where preparing my self to put my graphics card in the oven or buy a new/replacement one but I´m not sure that it is with the graphics card alone or something else might be causing this. I´m understanding it as my screen shoot should show the error stribes as well, should this be a graphics card failure.

Any suggestions?

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Please give us the last four figures of your serial number so I can check it on the recall list.


L5RU and I can give you more digits if needed.


this system doesn't qualify for the graphics card recall. The recalls were for mid-2011 core i5 and i7 iMacs with AMD Radeon HD 6970M graphics cards.


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What you've described indicates a bad graphics board. On these models the video RAM is on the graphics board not shared with the system RAM. Glitches from a graphics card will not show up in a screen shot. You can try the oven fix as a last ditch effort, but that would only fix it if it is a solder joint issue.

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Thank you for clearing up the screen shot element as this was making me unsure what to make of my errors. Would you happen to know a link to a oven fix (in case it would be a solder issue)? I read about it but fail to find it again at the moment. And I also didn't understand how to take apart the graphics board from the cooling plate - incase anyone has a link regarding this particular thing.


If you google graphics chip oven solder reflow there are several sites out there with instructions. Since reflowing solder in an oven isn't really the right way to do it, I can't say that any one instruction is better than another.

This guide covers the removal of the graphics card and heatsink. There are 4 spring loaded screws that sandwich the graphics card between the heatsink and backingplate. In step 10 you can see the screws on the heatsink, 2 on either side off the heatpipes.

iMac Intel 27" (Late 2009 or Mid 2010) Graphics Card Replacement


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