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iMac 21,5 Mid 2011 won't turn on 1 LED lights on


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Hello guys,

 

I got two iMacs 21,5" Mid 2011 which shows the exact same curious error.

I have dissassembled it to test some Graphics Cards and reassembled it again. After power is plugged in, its fans start automatically. First in normal speed and after maybe 15-20 seconds at FULL speed.

The last of the 4 LEDs, from left to right is lighting up. I tried a few times to dis- and reassembly this iMacs with no changes.

I tried also to put out the small battery out and in.

 

One time, I reassembled it wrong. There are to 7 PIN sockets for HDD PWR and the other 7 PIN socket for camera and other things, I accidently put them wrong in, for one time.

Maybe it is one reason? 

I don't know.

 

Maybe someone can help out here.

 

Greets

Edited by romac90
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