Intel 6200/6250/6300/6205, Win7 / Win8 64 bit Enterprise Edition, Dell Update Package. WiFi driver version: 15.8.0.5

My AlienWare 51 continues to reboot after being logged into the OS for 5 minutes. I purshased a new PSU, a new MotherBoard(same model as the one that comes with the X51) I puled each Graphic Card one at a time, same with the RAM. I even re-installed the OS.

As I began using the newly bought PC, I noticed that my screen was blinking randomly among the day as I work, sitting in front of this PC all day/everyday 8 AM - 5PM. Sometimes 3-4 times in 5 mins or sometimes no blinking for 3-4 hour.