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

iMac screen won't turn on unless power cable is at a certain angle.

If I put the power cable in all the way, the fans will run (at full speed), but the screen will not turn on. If I move the power cable out a little bit, it will boot with the screen on. Once I have it booted, I can move the power cable all the way in. Does this call for a replacement power supply?

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I’d start with a new power cable. much cheaper to boot.

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I’ve tried that.

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Why are you messing with it after it runs OK?

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