i connect vcr player's yellow red white cable to av-rf modulator, and from av-rf modulator to mac hybrid stick.

but i don't receive signal from vcr in live tv mode with auto tune. ( tried composite video , and s-video also but no signal)

i know nothing about technical stuff so would like to ask for some help on this. 

 ( have tested vcr player and av-rf modulator with my tv, everything works fine)

thank you so much for any advice
 

I have the same problem. I've waited 48 hours for a MAC support person to call me back from Pinnacle.  Now I'm hoping that someone in this venue can help us.