Glitchy GPU?

[d000hg]

The last couple of days, I've had my monitors do the same thing each day. I have 2 monitors plugged into the two outputs on my graphics card.

- Both monitors suddenly go black for about 1/2 a second
- This happens again about 2s later
- When they come back on, all my windows are moved to monitor 1

I don't know if it's a coincidence but I did a big Windows Update sesh the day before this first happened. But I've no idea if it could be a driver bug or hardware. Can anyone suggest anything based on the symptoms, or give me things to check to help narrow it down?

[VectraMan]

My desktop does the same screen blacking thing, though I only have one monitor connected to it so I don't know if it messes up the Windows. This usually happens on startup, and is something to do with the Windows 7 permissions thing that's meant to dim the display, but on older graphics cards is only capable of blacking it out. I get exactly the same thing happen if I switch my printer on, for example. I don't know why as it doesn't actually ask for permission for anything, but it always does this and I haven't been able to work out why.

[DaveB]

Sounds like a driver issue to me. The card is tying to work out which monitors are connected and it's getting confused and blanking the output to each one as it does it.