As the title indicates, I'm not really sure if my problem is actually hardware or not, but this seems like the most appropriate place to post it. Since I did a clean install of the OS, I've had several instances where the monitor's screen momentarily went black, and upon recovery Windows popped a dialog stating that the driver (Nvidia 320.49), which I believe is the most current one, had stopped working and then was started again. However, just a few minutes ago, the screen went black and didn't recover, making it necessary to do a forced reboot. Curiously, while the primary monitor went black, the secondary one didn't, but became striated with zig zag horizontal lines. The combination of these occurrences makes me wonder if the problem really is just the driver, or if the video card (Nvidia GeForce 460 GTX SC) is failing? What is the best way to determine which is which?