I usually know how to hook up a vcr to a tv, but this one has me stumped. The back of the VCR has two places to insert a cable. One is VHF/UHF 'in' and the other is 'out'. Then there are places to hook up audio and video. Then on the tv there are hookups for cable and also video and audio. I've tried everything and all I get is a blue screen when I play a tape in the vcr. What am I doing wrong??