Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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No Power, Diag LED #4 briefly lights...How test Pow Sup and MB?

Dead IMAC.....is there a procedure short of replacing the power supply and the logic board?

Once you remove the LCD, you can see the 4 diagnostic LED's on the Logic Board.

When I apply AC power, LED 4 breifly lights up and then goes dark. The Start button does nothing.

Is there a way to test the Power Supply?

How do I know if this is a Logic Board issue?

I bought this with a known issue and no ram and no Hard Drive.....silly me.

Answered! View the answer I have this problem too

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You'll need to install some ram to start with and either have a OS installer disk or have a bootable thumb drive/HD to run the system.

OK, so assuming you have the bare minimum required to run the system here. I wound inspect the LVDS cable and the horz. sync cables make sure they are not damaged also check the connectors as well. Your symptom sounds like something is shorted.

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Paul Singer will be eternally grateful.
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