Thanks to both replies-- I will try new cables before I look any further
I don't know that you need a new cable, but try a different one (if you have something). Even coax with F-RCA adapters will work fine
if there's no other problem. Even if you only have one piece of coax that's long enough, if you have F-RCA adapters, plug it into the green jacks- that will give you a picture on most TVs with component video because the green carries the synch signal. If you have bars, they'll still show up. Also, coax works fine for component, composite, digital audio, analog audio, two can be used for S-Video (with an adapter), and can be used for HDMI with baluns.