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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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LED501 (#1) is on but nothing when the button is pressed

Hi,

I’ve got a A1312 and try to fix the problem :

The first led (LED501) is on, means that the power supply is good ?

But when I press the button to power up the iMac, nothing is happening, LED502, 503, 504 stay off.

I think the problem could be the button or the power supply ?

Thanks!

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Have you tried jumping the button contacts at the logic board?

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It does sound like you have a bad power supply iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply and here’s the guide iMac Intel 27" EMC 2429 Power Supply Replacement

Often a power surge or a lighting strike will kill your power supply. Do make sure you have a good surge suppressor (not a power strip which has no protection), better yet get a good UPS!

iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply图片

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iMac Intel 27" EMC 2309, 2374, 2390 or 2429 Power Supply

$139.99

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Hi,

Yes I have tried to jump the button contacts on the motherboard but still nothing.

Could the motherboard be dead ? Or it’s only the power supply?

Thanks!

完成的

Time for a new power supply

完成的

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Alexis Martin 将永远感激不已
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