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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Replaced CPU , Mac seems dead. LED 1 ON, LED 2 goes on - off - on

Hi all.

Wanted to replace my i5 3,1 GHz with a I7 3,4 GHz ( a 2600 model) , replaced the logic board, but mac doesn’t turn on.

Replaced the known good i5 3,1 GHz, but same problem.

LED 1 is ON, LED 2 goes on and off (cycling) w/ short fanspin.

Anyway I can measure the PSU for defects?

Any other steps / defects I should check?

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Hello! I have the same problem. In your second step I am in doubt if you returned the “known good” logic board or if you seated a known good processor in the new logic board. Can you please tell us?

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Solution retenue

Both were good known CPU's , the problem ended up being dust in the RAM seats. cleaning them and reseating the S0DIMMs solved the problem.

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Hk Barry sera éternellement reconnaissant.
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