When I boot up my machine, it comes up with the lowest resolution possible. I can't change to resolution in the Display settings unitil I do a shut-down/restart. At this point, I change my setting to 1024 x 768, and everything is great, until I shut it down again. If the machine is off for more than a few minutes, it will boot up with the low resolution setting again. Is this a video card problem, a BIOS problem, battery, or windows problem? How do I fix it?