My monitor turns white after about an hour of use.

Hello, when i start up my computer everything is fine, but after about an hour my monitor just turns white and renders my computer worthless. I know its not my monitor because i have tried on 2 others and I have also tried VGA and HDMI. Here is my build.
CPU Intel Core i5-3570 3.4GHz Quad-Core

Motherboard ASRock H77 Pro4/MVP ATX LGA1155

Memory Patriot Viper 3 8GB (2 x 4GB) DDR3-1600

Storage Samsung 840 Series 120GB 2.5" SSD

Video Card Asus Radeon HD 7850 2GB

Case Cooler Master Elite 430 ATX Mid Tower

Power Supply Antec 520W ATX12V / EPS12V

Optical Drive LG GH24NS90 DVD/CD Writer

Operating System Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit)
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More about monitor turns white hour
  1. use this and check the temp of your graphic card she could be overheathing check if the fan spin on her http://www.hwinfo.com/
  2. Does the white screen thing happen when you're surfing the web or when your computer is left idling or when you're gaming ?
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