I have had a problem with my PC shutting down during games since I bought it back in 2010. It is an alienware (I wasn't aware of how much they suck when I bought it) with an i7 930 cpu and an alienware watercooler. I have replaced nearly every stock component (gpu, ram, hdd) as well as reinstalled god only knows how many times. Yesterday when I was playing I had little control in game (far cry 3) and my character continued to shoot his gun for a good 20-30 seconds. I have also had problems opening certain programs and other just really odd things. I'm thinking I have to replace the CPU and mobo, check out this video that I just took when my system crashed on far cry 3 and let me know what you think, all help is very appreciated. Thanks!
https://www.youtube.com/watch?v=N2SpvV4mG6g&list=UU0kA8PC3cytjVx8MTjDkzxg&index=1
https://www.youtube.com/watch?v=N2SpvV4mG6g&list=UU0kA8PC3cytjVx8MTjDkzxg&index=1