We bought a new HD TV and are connecting it to the cable box with the hd cables.
The blue ray player we have works just fine, but our old vcr will not tape shows. The TV shows no signal when we attempt to select the vcr.
Any suggestions?

Hi. What is the type of connection currently between VCR and TV?

And is the VCR connected in a chain or to anything else? e.g. Cable Box to VCR to TV?

Look for problems if you accendently connect 2 OUTputts or INputts then you should change of entrance