I'm having trouble with one of my monitors turning on and off for a few seconds and lines flashing on the screen. This only happens on my main monitor. When I unplug my second monitor, the main monitor acts normally.
I have a Radeon HD 6850 and am running Windows 7 64bit
I've installed the latest drivers for the graphics card.
This only had just started happening when I replaced my Motherboard/Processor/RAM and had to change from 32bit to 64bit because of the amount of RAM. Also, I had been having BSoD but have fixed that because I had a faulty RAM stick