Been having this problem for about a month now. Out of nowhere, the screen will go blank, my monitor power light begins to blink as if the computer had been turned off, then the sound locks up. Only way to get out of this is to do a hard power-down of the PC, then start back up. Seemingly happens at random. I'm at a loss here. I thought perhaps the videocard were dying, but it's only a few months old. I know my PSU is sufficient for this rig. Any ideas?