I have a new Dell XPS 400 with an Nvidia 7800 GPX (I think that's the model number). Anyway, I simply get a "No Signal" on the TV screen. The connection should be pretty basic...a DVI connection to the Nvidia and a VGA connection to the TV via a DVI/VGA adapter. The TV input is set to video 8 which is a dedicated PC input which is the VGA port. Any ideas? Thanks.