i have an older computer. duel core. works fine. ive allways had xp on it.just downloaded latest .iso of ubantu, burned dvd. restarted computer. Loads Dell startup screen but when it tries to load the dvd my TV (not computer) gives me an error message about "bad video input" then goes black.....

its a 32 inch sharp tv. Connected with a dvi to hdmi cable.

any suggestions?