Issue installing new GPU

Jul 11, 2018
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So I just installed my new gpu on my system *Ijust built my pc and I was using it without GPU for a while. Today I received my gpu and installed it, I already installed the drivers and everything, but my pc is not working well, it is so slow and it is crashing. My pc was working totally fine before installing the gpu.

System specs;
i5-8400
gigabyte b360 hd3
gigabyte windforce gtx 1060 6gb
corsair vengeance led settted at 26666mhz.
corsair cx550m 550w
You guys have any idea about what could be de reason of my issue? Ive tried to change the gpu to another pci slot and it is the same. The pc works tottaly fine withouth the gpu