repeated hook-up problem

What is going on?

I have a cheap Jensen TV, a cheap Polaroid DVD, and an ancient JVC VCR.

I hook the VCR to input #1 (composite) with no problem. I hook DVD to "DVD" input (component) and I get blue screen. I repeat with composite input #2 and I get a blue screen. I repeat with S-video and I get a blue sceen I repeat with the 2 different composites, if I unplug the VCR and use composite #1 the DVD works, if I plug the DVD into composite #2 (front panel) the VCR works but the DVD still doesn't.

I have try two of these TVs and this is the 2nd (different brand) DVD I've used.

What the is going wrong?

Jai

PS: My main system is a Marantz intergrated recvr with HD and all the bells. I hooked it up by myself without a problem...

Thanks in advance. Jai