Hey guys, I just bought an AMD Radeon HD 7750 graphics card last week and an additional 4 GB RAM Module for my PC. It's an Intel Core i5 3.33 GHz with 10 GB of RAM (with the new addition), my Power Supply is 400 W, and that's about what it takes to make my graphics card run. I'm not a pro and I don't know what's the problem, but it seems like the ONLY game that is working perfectly is PlanetSide 2. Whenever I start a game on CSS, CoD, NS2, etc, my PC just reboots itself completely after like 2 minutes of gameplay! After my PC has restarted, it says "An unexpected shut down has occured". This is incredibly annoying, I can't play my games... Anyone has suggestions on what I should do? Thanks!