This is the page you want if you're experiencing audio-related problems with Aliens vs. Predator. I have no video on the monitor. Some video cards can only go to a certain resolution, if you set your AvP settings to a high resolution try setting them to 640x480 or 800x600.
Some colors are ugly, and horrible.
Make sure you have your monitor's Gamma set to default or something close. Everything is blurry. It is important in all games to have the latest drivers for your video card, search here for yours . Also, its best to have the newest version of DirectX, so go to Microsoft's DX home page . Continually check for updated drivers, and I hear a new one with better support for alpha blending is on the way.