Hi I recently upgraded my motherboard, processor and graphics card. I have a 2 year old power supply 600W and I think its causing this problem. Most games that are demanding I can't play as as soon as I get into the game my monitor will turn off and the PC will restart. Windows will then report a bluescreen. I have a gtx 970 and a i5 4690K. My PC didn't have this issue for a week and now I am unable to play games. I'm pretty sure my old power supply is dead but I'm unsure if should buy a new one if the power supply is not the issue. How can I test if it is the issue? Help would be wonderful. Its also rebooting when I even browse on chrome or watch Vids. I'm not 100% sure its the power supply but I know its not the graphics card as I sent it back and it wasn't faulty.