I assume you're talking about a cable modem. It's the same.
You could extend the cable from the old PC location using a "barrel"
type
connector. Or if the new location is closer to the TV use a cable
splitter.
-Graham

just so i understand you right (i'm thick headed), i can move my pc into
another room (along with my cable modem), and connect my modem up with the
cable that USED to be hooked up to a tv and my pc will work?

Yes, your PC will work... But your modem might not.