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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Will not power on. Tried everything. HELP

iMac intel 27” EMC 2429 Mid 2011. Hadn’t started it in maybe a year, it had been plugged in the whole time. Went to start it…dead as a doornail. No sound, nothing on screen. Believe I’ve tried everything, including: hold button 10+ sec; unplug power cord from wall for a minute; held button for a minute; (yes..cord is good—even tried the cord from my NEWER iMAC…did continuity check on the cord, checked voltage in the cord end); power button feels like it’s working fine (tactile feedback). So…that was all the stuff on the “outside”. Then we cracked the case to check the LED’s. Power plugged in, LED 1 blank; hit power button no change (all blank). WHAT NOW? Help and thanks in advance!

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internal power supply is probably broken.

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Thank you for responding. Would a bad power supply be consistent with LED1 being NOT LIT (I.e. the light is out) when the computer is plugged in to known-good power? I thought LED1 was the indicator of power BEFORE it hits the power supply? Thanks for any clarity anyone can bring...I'm hesitant to spend $150 on a new power supply when I'm not sure it'll work...

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