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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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No power, diagnostic light goes out when power button is pressed

Hello. It's a 2390.

No power, no noise, absolutely nothing.

When I plug the power cord in, one light lights up, but then goes out as soon as I press the power button. The light doesn't come back on until I unplug it and plug it back in.

But still no noise, absolutely nothing.

Most common answers here are power supply board or logic board, but in those posts, the folks hear some sort of noise, clicking, fans or something. Mine does nothing.

Any thoughts?

Thank you,

Christina

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Did you check the DC side of the power supply with a volt meter? Did you try a different AC power cord just incase its bad?

I would still replace the power supply as you clearly have a power issue.

Update (02/16/2018)

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Hello. I did check with another power cord, sorry I didn't add that info.

I will check the wire. I have to dig around for my volt meter. As soon as I find it I will update. I did also unplug the power switch cable on the logic board, and plug it back in.

Am I wrong in thinking is odd that the power switch is cabled to the logic board? Wouldn't it make sense that the power switch cable would go directly to the power supply? Is there a cable I can check going to the power supply? That is, when I find the volt meter.

Thank you!

Christina

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The power switch goes to the logic board not the power supply in this series.

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