I want to be able to hook my MBP (purchases March '09) to my tv to watch shows through my laptop. I've read the posts and see what cables I need, but I realized I only have USB ports, no DVI ports! D'oh! Never had one put in when I bought it! (I AM blonde after all ). Can I add a DVI port to my existing MBP or could I hook up to my tv via USB? Thanks for your help!