Stuck in progressive scan mode.

Based on your description, it seems that you set the DVD to progressive scan output, but have it hooked up to a TV (CRT) that cannot accept this signal. Because the TV can't accept the signal, you can't view the DVD menu to change the setting back to interlaced.

On the back panel you have "Component Video Out" for output via component cables, but there is also a yellow RCA connection labeled "Video Out". This is a "composite video" connection which does not support progressive scan. Try disconnecting the component cables and connect the composite video to a TV. The DVD will likely (hopefully) send a compatible signal (480i) through this connection, which will give you access to the menu.