I recently bought the components to put together a new PC, I managed to assemble everything ok and install windows no problem. It all seemed to be working fine but after a few hours of running the monitor goes black. The monitor power light is still on (not in standby) but the screen is off. This will happen normally after an hour or so. If I switch the monitor off then on again it will return to normal but after a few minutes it will again switch off. Nothing else is affected when it turns back on, the screen is exactly as normal. It will happen when in BIOS or in Windows XP so I'm guessing its not a windows problem or drivers issue. I flashed the MOBO BIOS but this had no effect. So I'm guessing the problem is either with my monitor or graphics card. The systems details are: Graphics Card - XFX GeForce 7800GT Monitor - Acer AL2032WA Any help would be much appreciated.