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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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LED#1 turns on with one blink and stays on

Imac doesn't turn on, all other LEDs 2.3.4 stay off, only turns on by bypassing the SMC with full speed of fans and no display no Chime, # 2,3,4 LEDs stay off even when bypass the SMC.

Tested With:'

1. Different RAM.

2. Different Processors intel i5.

3. Tried to Turn without Graphic Card.

4. Without RAM.

NO Luck!

Have no idea about Output Voltages of Power Supply.

Any help Would Appreciate thanks.

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Solution retenue

That LED only indicates startup voltage is present (power from mains to cord to board).

I do not have any schematics or information about output voltage from the PSU. Maybe some who does will chime in.

If this answer is acceptable please remember to return and mark it.

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adeel sera éternellement reconnaissant.
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