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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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#1 LED works but nothing else

i have the issue where the #1 LED works but nothing else. I hit the power button and then nothing happens, no more LEDs, no power on, no fan noise, nothing. has anybody got any clue as to why that would be? i have just installed an SSD into the machine and the problems start after that. i have tested the power supply according to several videos on youtube and it seems to be working so don’t think thats the problem.

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For me it turned out the flat plug that connects the display to the motherboard was broken. You should check if it's connected properly.

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@mayer - FYI - Power button not working

Shaun, Did you check your cable connections?

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All the #1 LED tells you is that trickle power is getting to the PSU, not that it is working. First check your connection to the logic board from the power supply. Use a multimeter to test the output. Next replace the power supply.

iMac Intel 27" EMC 2309 and 2374 Power Supply Replacement

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Shaun Cullen will be eternally grateful.
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