If your TV does not support 480i (which would be odd), then no video will display. PS2 plays everything except progressive scan games (
http://en.wikipedia.org/wiki/List_of...ith_HD_support) in 480i. Some games can be forced (just as the article states) via holding the Triangle and X buttons down after the PlayStation 2 logo appears. This does NOT apply to PS1 games. Also make sure you are using component cables (and quality shielded ones at that).