No video output from Magnavox VCR (MDV560VR)

All of a sudden I can't get the video signal from the VCR side of my Magnavox MDV560VR. This is a combination DVD/CD/VCR. I have it plugged into the A/V tuner which in turn is plugged into the TV. For all these years with the analog TV, the Magnavox worked just fine. But things changed when I went to HDTV. Now I can get only the DVD signal out of the Magnavox. I can't get it to switch over to the video signal from the VCR. I have had the Magnavox plugged into the A/V tuner with both the single-line DVD/VCR Out cable as well as an S-video cable. As I say, that worked well with the analog TV. There was a three-week period during the changeover from analog to digital TV when I didn't use the Magnavox at all. Last night I tried again and couldn't see the VCR signal on the TV. I then added component-video cables from the Magnavox to the A/V tuner (which is similarly connected to the HDTV by component cables.) With progressive-scan, the DVD picture is impressive, but there's nothing from the VCR. In the old days I had the TV antenna plugged into both the Magnavox and the DTV convertor. Now that the HDTV is here, I have plugged the DTV box into the Magnavox, and I will use the DTV as my tuner for the Magnavox from here on. I know it's working, because I can hear the audio portion of the television programming through the stereo. Did my Magnavox VCR fail during the three weeks I didn't use it? Or am I missing some software set-up trick? TIA