Sudden pixelation on screen?

[Kurasii]

So this happened just 10 minutes ago. It's never happened before and I was just browsing online when it happened. Suddenly the screen started flashing/pixelating in the upper left hand corner. I tried to screenshot it in hopes it was just Firefox, but it didn't show up in the screenshot I also noticed it did it on my desktop too, not just on Firefox. Would this be a graphics card thing? Is it bad news?

It happens randomly in bursts, it just flashes on and off really quickly.
I can kind of "erase" it by highlighting my desktop under it sometimes.



Help!

Edit: Oh god it went over even further this time

[patio]

Remove all power and remove/re-seat the vid card...any change ? ?

[Kurasii]

Remove all power and remove/re-seat the vid card...any change ? ?

I'll have to check when I get home from work. I don't have quite enough time to haul everything out from under my desk at the moment :/ I'll try later though and let you know, thanks

[Kurasii]

Remove all power and remove/re-seat the vid card...any change ? ?

After coming home from work, the problem hasn't happened in the 2 hours I've been online... Should I just leave well enough alone, unless it happens again? Do you think it's ok?