Afraid I have damaged my gpu

Mar 27, 2018
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So I wanted forever to try, and make my own backplate for my gpu (asus 1060 dual 6gb). It currently don't have any. I went ahead, and made one out of plexi glass. After cutting af cleaning I've just placed it on top of the metal, or what ever that are knots on top of my gpu are.
Now the gpu makes a quick electric noice, when ever I boot up the PC.
Have i damaged it and will it be broken within a week?

I have only booted up the to plate on once, I pussyed out and removed it right away.
I also tried, and made sure there was no static electric left in the plate, when it was placed on the gpu.

Btw sorry for bad english,