possible damage

So my pc suddenly started turning off immediately after I turn it on and then it keeps trying to turn on by itself without any success. Also, the second it stays on, the only thing that doesnt work is the case fans, everything else turns on. I did the PSU paper clip test and it worked, the PSU...

GPU Gigabyte gtx 1050 ti CPU i3 7350k 4,2ghz So my fps has been dropping in all games ive played (rust,ark,pubg,six siege) For an example about a week ago i had stable 80 fps in Rainbow six siege with the exact same settings as now but now i get 50-70 fps. In ark i used to get 50-60 fps on...