I have this exact same peoblem! At first everything was great, I started a city, and had a little fun. Then all of a sudden my computer turns off! The screen goes black, and the mouse and keyboard don't do anything. The wierd thing is I have this blue light on my desktop, when it is on the light is blue, when it is off, well the light turns off. After the game crashes and my computer shuts down, the blue light stays on! I'm so confused, it's like my computer only half shut down, or something like that. I can't believe how much anger I feel for EA! And I know it's not my computer because I'm above the required specs. I have a 650ti graphics card, 400w power supply, 6GB of ram, and an AMD Phenom II 2.9 processor with 4 cores. I can't even play the game! Seriously EA!? I don't think I have ever hated a company so much.