iMac won't boot. HD and FAN are spinning for 1 sec

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iMac Intel 21.5" EMC 2544

모델 A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 또는 3.1 GHz Core i7 프로세서

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Mattis @idoc

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게시일: 2017년 3월 23일

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iMac won't boot. HD and FAN are spinning for 1 sec

Hi, When I power on my iMac I hear the HD and Fan spinning for 1 second. Then it stops and does the same thing over and over. 1 LED is steady the second LED lights up when the fan and HD start spinning. See pictures. What could be the problem? If the power supply would be damaged there shouldn't be power, LED or spinning HD and fan right (even when it's just for a second right?)

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Dan @danj 평판: 479.5k Self employed contract worker 35 329 971 · Answer 1 · 2017-03-23T05:24:31-07:00

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Dan @danj

평판: 479.5k

Self employed contract worker

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329

971

게시일: 2017년 3월 23일

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Here's a breakdown of what the diagnostic LED mean: Diagnostic LED's

From the sounds of it you have a logic board issue with the power regulator logic.

Do you have your system plugged into a surge suppressor or UPS? If not, you may want to get one, its even possible the suppressor is shot as over time it does lose its effectiveness.

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I've ordered a new power supply. Keep you posted.

Mattis 의 2017년 3월 23일

Replacing the power supply didn't solve a thing...

Mattis 의 2017년 3월 24일

I thought not, sadly this is a logic board issue as the regulators are there.

Dan 의 2017년 3월 24일

What exactly do i have to change on the logic board?

Mattis 의 2017년 3월 24일