Right so I replaced my PSU and it sadly did not make a difference, I was wanting to get a new gpu in a few months anyway, so I have bought a new one. That better fix it! If I find out anything else about the problem, I'll let you know
So, I was playing games on my custom pc and mid-game, my pc suddenly crashed and displayed a blank light grey screen.
-I left my pc for a bit as I had to do something anyway
-I came back and booted onto windows, I logged in and it immediately grey screened again.
-Now don't even see the logon...