My sons 2010 imac 27” hasn’t been turned on in 5 years. Worked before that. I turned it on today and nothing turned on. I removed the lcd screen to gain visual access to th diagnostic LEDs and saw the number 1 LED was on. I pushed the power button and the number 2 LED blinked and then both 1 and 2 shut off. I removed power and repeated only this time I shorted the power switch on the board and got the same result.[br]
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I tried holding the power button for 1 min with and without power cord and no change.[br]
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Given that it worked before not using it it for an extended period I’d be surprised if the power supply board went bad but of course it’s possible.[br]
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Anything else I should try?