I recently put a new graphics card into my computer, only to find out that i couldn't use it for an unrelated reason. So after finding this out i replaced the newer card, with my old AMD Radeon HD 6670. But now its seeming that when i open any game i try to play, "league of legends" for example, a strange sound comes through my headset and then my monitor goes grey, says it has no signal, then my PC restarts completely. Only to open up and it tell me that I've blue screened. It had never done this before i put the card back in. I did download a driver for the newer card i attempted to use but then took out. but im not very computer savy so im not too sure why that would matter. Someone please help me solve this issue.