Screen blacks and display changes

[Skylinefranc]

I just recently noticed that my screen will black out for a few seconds and come back, and when it does it changes my monitor set up so that 2 is main monitor and 1 is the off monitor, I tried changing it so it only showed monitor 1 but it still seems to be blinking,

Specs
Mobo: Gigabyte GA-Ma770T-UP3P
Processor: AMD phenom X2 550
RAM: Pioneer 1333 4GB(2x2GB)
Video card: Radeon HD 4870.

 

[Zidane24]

Have you updated your chipset and graphics card drivers lately?