On my RF modulator, the red light will not come on until it get a video signal. When you power off DVD, D* receiver, or whatever, it shuts down RF Mod. to save power usage. If you are not getting a red light on RF mod, its either hooked up wrong or dead. My guess, if you got the same setup to work with DVD, but not HR, that its hooked up wrong somewhere, most likely the same kind of simple mistakes I make all the time. Hook yellow to DVD, red/white to HR, check other TV's. should get DVD picture and HR sound. I don't see any inputs on the back from the picture I saw, did you maybe hook up to the component (Y, Pb, Pr)?