suddenly died no diagnostic lights visible
Do you think that this is a broken PSU?
Probably check all your cables connections going to the power supply. If that doesn't reveal anything take the power supply out and check for any burnt spots, or blown compasitors. and try another wall socket. Also check that the power button is working right.
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Here's how to remove it, does be surprised if you visibly see nothing wrong: iMac Intel 27インチ EMC 2309と2374の電源の交換
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