Capture live feed from G4 laptop 15"

Hi,

Trying to capture through the S-Video out, into my Igniter card with FCP 4. The result is a split screen with top half being my laptop screen squished, and the bottom half being pure green, even though it shows fine in the capture window and the NTSC monitor... Any idea why?
I have tried pretty much everything from changing resolutions (although I need to have it at minimum 800x600), to changing the menu bar from the laptop screen to the NTSC monitor (Sony).

Any suggection is welcomed!!

Thank you.

P