I have an old Dell tower running win xp with an LCD monitor, and today the monitor refuses to show anything but a blank white screen. I attempted to adjust the brightness to no effect. From the sounds of my computer it's still booting up properly and the monitor does seem to be getting a signal from the computer since it does that thing where it flicks dark for a second as it boots up. My monitor is as old as the tower. Could it be going bad or possibly a problem with my video card?