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

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Fan running in full speed

I got this imac from a friend, the original problem was that not power at all, so i made all the diagnostic suggested in the service manual and i concluded that i have to change the logic board, and i did it, now the status is the following with the good logic board:

When i plug the ac cable…

1- Led #1 is on

2- When i press the power button Led #2 flicker for less than 1 second and off

3- The fans start to work at full speed all of them and stay on forever jeje.

And that’s all…

I press the power button, stop for a second, and all the fans start to work again.

I change the RAM memory too for a good one and nothing happens :(

If anybody can help me with this i’ll appreciate it. Thanks.

Answer this question I have this problem too

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1 Answer

Sounds like you got a bad logic board. Review your cable connections incase you missed one.

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3 Comments:

I change it for a good one, so maybe this one have problem too?

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@Gary - One of the problems with these older systems is finding good parts as Apple has long since stopped offering new parts, all you can find is recycled parts. Some folks don't make the effort to test the part before they sell it so its possible you got a bad one.

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Thanks you Dan i'll find the way to get a good one!

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Gary will be eternally grateful.
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