Green screen with Marvel G200?

[majimei]

I´m at a friend´s computer that have the same Marvel g200 than I, and I have copied
an .avi to his hard disk, and when I output to video, it only appears a
green screen (on the viedo-tape image). My computer hasn´t that problem. Why
can be this?
please if you know the answer, do it quickly, I have no time for this. (my
pc is broken)
sorry for my english
thanks