I have a system that's acting strange. It's a new mobo, cpu, ddr3 & psu. It has a HD 5850 GPU & has been working great but over the last few weeks it's been randomly going blank. I could have the pc system on & then all of a sudden I get a black screen. No mouse cursor, no response from any keyboard commands & the only thing to get out of it is by hitting reset. The screen is not completely black, its like a off black, lighter that the post screen black & the monitor is active, best way to describe it is a charcoal colour screen. I can't think of what's causing it. It could be left idle, in middle of a game, web browsing. Sometimes it don't happen all day & the next it happens all the time. Any idea's?