Re: Can't get TV display
The video card should have come with an adapter cable, It looks like your card has a combiniation connector to include svideo out and rca, I believe the pvr350 may come with the same or similar adapter cable.
You can enable tv out on the pvr350 in setup.
while in mythtv frontend go to Utilites/Setup>Setup>tv settings>playback
it is the fifth page check the box to enable tv out on pvr350
Hopefully you have a monitor connect to get you through the setup.
Nothing is ever easy, but if it is difficult you must be doing it wrong.