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모델 A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 또는 2.8 GHz Core i7 프로세서

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Black Screen after changing thermal paste

IMAC 2011 21.5 EMC 2428

It was working perfectly.  It was opened to change thermal paste.  Now it turns on but the screen goes black after a few seconds the fans accelerate.  

The diagnostic LEDs light up the 4.

 Apparently there was no error in the assembly or damage to any cable or board.

 the machine had no problem with the video card before

 After reassembly, he presents this symptom.

 Only the thermal paste of the processor was changed.

The video card has not been tampered with.

 Do you have any tips or details that I may be missing?

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More often than not, you likely didn’t mount the CPU correctly. You’ll need to pop is off again to make sure the socket pins are not damaged and when you remount the heat sink make sure you slowly tighten the screws in a cross pattern like you do for changing a tire rim, tighten each screw in a star, or criss cross, pattern.

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the screws on this heatsink seem to be wrong, they don't seem to want to screw in the normal way. Before reading your comment, I took apart everything and retained the heatsink screws again, this time without tightening them too much. I reassembled everything and it worked again.

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@friedericham - If you're set don't forget to accept the answer - Thanks!

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