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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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iMac27 No signs of life, led 1 blinks twice.

Hi, I got this iMac to fix and I have been having a really hard time. When I plug it in led 1 blinks twice but never fully turns on, it only does this when I plug it in then it imminently stops. The PSU does make a slight buzzing noise but nothing noticeable. I have replaced the PSU with a newly bought one from eBay. I have already also tried different RAM. Here is a video of what happens when i plug it in.

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Bentley100 post a pictures of both side of your logic board with your question. that way we can see what you see.

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You have a short in one of the power rails within the logic board. This could be a blown GPU board or a cap has failed. You'll need to remove the logic board and inspect it and the GPU boad for any burnt or damaged parts.

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Bentley100 will be eternally grateful.
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