I just had another thought.
I have wondered, but never investigated, if the TV output from a PC is
of a fixed format, or if it is in fact dependent on the format of the
source material. If the former, then one would have to assume that PCs
sold in a given country would output the format appropriate for that
country. Hence if your PC and TV were purchased in areas that use
different TV systems, my previous response would not help you solve
your probem. Of course, if your TV is multi-system then your should
have no problems with any format discrepancies.