My wife and I bought a cheap DVD player and the DVD player only has composite audio/video. The TV that we intended to hook it up to only has a coax input. So I took an old (unused) VCR that has both and ran the DVD player's output into the composite audio/video input of the VCR, then ran the coax output of the VCR into the TV. It worked with one problem: the picture keeps going dark to light, light to dark, dark to light, light to dark, dark to light, light to dark. And it doesn't stop there. It then goes dark to light, light to dark, dark to light, light to dark and this repeats indefinately. I took the DVD player and hooked it directly up to our other TV and it worked fine. Any know what the problem could be?