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
  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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