I have a 400w power inverter that I have used many times. It generally works fine, but it wouldn't power my gf's Dell Insperon 8600 last week. After doing some Google research, it sounds like it is because my inverter produces a modified sine wave instead of a pure sine wave.

I was going to order a 150w pure-sine wave inverter to use with the laptop, but I wanted some confirmation before I order it. Do you guys think that is the problem and a decent solution?