Hey, I bought and installed a Nvidia Geforce GTS 250. Once installed, I turned on the computer and everything seemed to be fine until I played a game and the computer shut down. There wasn't a blue screen or anything, but I realized my computer's power supply wasn't good enough. I stopped playing games that had high graphics, but then my computer began to bluescreen almost every time I played any game. For instance, it would blue screen on the starting screen of Dominions 3, as well as when I was playing Haven and Hearth (A java based game with sub-standard graphics). Thinking that this was all related to my power supply, I eventually bought a new one. I can now play high graphics games without my computer blacking out and shutting down, but it still bluescreens very often whenever I play any game. Any help would be greatly appreciated.