If your card has a VGA or DVI output, and your TV has one of those matching connectors...you should be able to hook them up. Not sure how it's going to perform, however.
Is it hooked up through vga or dvi? I have my 56" through vga and quality is awesome. I rarely touch my dvd player since I can watch all my movies from my pc.
Oh, and the best part.....so cool to browse the web on such a big tv. I do it all the time. Just get yourself a good wireless mouse and kb and you're set.