I was just browsing with google chrome and randomly my screen flashes, and then turns to black. A white line at the top left flashes for a few seconds, but then my computer returns to normal. It was slightly slowly for 30 seconds, but then went back as if nothing happened. I have a Kaspersky Internet Security 2013 license and run frequent scans with MBAM, so I'm pretty sure this isn't a virus. I have Windows 7 Professional 64-Bit. Can anyone explain what happened. It sort of freaked me out, and I can't find the answer anywhere else.