Help with PC to TV

I have a scart split box which should take the 6 inputs into one
output and into my tv.

It all works except from when I try to connect my pc with a
s-vhs cable which is connected from the pc´s tv-out to the
scart box.

When I try to connect my pc directly to the tv the signal is ok.

What can I do ??

I have a

Fujitsu Siemens Laptop

Dantax TV

I have tried to connect my dvd and my playstation 2 and they all
go through the scart box .

Best Regards

Enable video output to the tv.

how ?