Are you using Windows 9x or ME? Do you have your monitor type set to "television"? (NT doesn't have a monitor type).
Can you try a different video card, or is the video on the motherboard?
Can you turn off the Alpine unit, boot into Windows, and then turn the Alpine back on; will that sync to the Windows video?
On the power issue, sounds like you need to ground your computer to your car's chassis. Run a wire from the computer case to your car's ground (any unpainted metal should be okay). It could be a crappy inverter. Some are better than others...
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