I built my first gaming PC about 2 years ago. I went on vacation 4 days ago and it worked fine then. When I came back yesterday it would turn on and everything would work, except when I tried to run a game it would restart. No idea why it's doing this. It's not my GPU as I took it out and put in my old one and both had the same result of it still restarting when trying to play a game. Help me please