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Model A1224 / Early 2009 / 2.66 GHz Core 2 Duo processor

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Will not boot. replaced power supply, still only 1 diagnostic light

Replaced power supply and memory, but iMac 20 still won't boot up. Only 1 diagnostic light

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Can you give us a bit more here. What happened to the system? Did you get a power outage or lighting strike nearby?


It was a slow process of not booting up. Held the on button for a few seconds, and then would boot normally. Finally reached the poin it would not boot at all.


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This sounds more like your drive has failed if you are seeing the screen and an folder icon is shown with a blinking question mark.

Taking the display off will impact the onboard LED's as the screen won't vibe wired in so while LED #1 is lit it only tells us power is getting to the logic board, as you also altered the RAM we can't rule out if the RAM is good of fully inserted. I would go back to the original RAM to see if things are working.

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No mattem what I have tried, the computer will not boot up, absolutel no activity, onthe than the one diagnostic led. I am considering replacing the logic board but would lie an expert's opinion before I do that.


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Wallace Hamilton zal eeuwig dankbaar zijn.

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