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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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suddenly died no diagnostic lights visible

Do you think that this is a broken PSU?

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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" EMC 2309 and 2374 Power Supply Replacement

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