Question rx480 seems to crash my pc

Oct 4, 2019
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I am running a gigabyte ab350-gaming with a ryzen 5 2400
I was given an rx480 since i have been using the onboard vega graphics and a friend updated his graphics card.
since instaling it my pc has started crashing. i get a blue screen and the pc restarts. Some programs randomly close when being used or fail to open. I have updated my bios, i have downloaded the newest drivers from amd... any advice as to why this is happening?
Just to be clear... if i disconnect the graphics card and restart my computer all the crashing problems stop.