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A good universal remote to use with that monitor is the RCA RCRN04GR, available at WalMart. I recently bought a 25" GE Remote Monitor XS Stereo from a Days Inn that was replacing all of those monitors with Flat Screen TV's. When I got it home I found that it would not go to channel 4 which was default with my COX Digital Cable Box. Channel 3 is the default channel on the monitor, so I ran an AV cable from the cable box, disconected the coax and hooked up the AV cable to the back of the TV and that solved the problem. I hope that answer was helpful.
I believe that channel 00 switches the set to the A/V inputs on the rear panel. You may have a bad cable or loose connection. Make sure the RCA plugs are firmly in the jacks at both ends.
The trouble may also be in the VCR. Sound but no picture is often a symptom of dirty heads. Try using a wet-type cleaning cassette and see if that brings the picture back. Wet-type cleaners come with a bottle of cleaning fluid which you apply to the strip inside. It's much more effective than dry type cleaners.
If this is a CRT-based TV and it's been played most of the time, you may have a bad picture tube, especially if strong red colors bleed to the right. CRT's dim with use, unlike LCD or plasma. But it could also be trouble in the video circuits - none of this falls into the DIY category, unfortunately. High voltage involved, unless you're comfortable around it and want to try turning up the screen controls inside the TV. If you do, let me know - but "no response at all" from the external adjustments points to a more serious problem.
If by saying the "aspect ratio changes" you mean the picture shrinks from top and bottom, I would suspect an intermittent short inside one of your picture tubes. The commercial skip function is not causing a problem here. It is the rapid change from dark to light that I believe is putting an extra strain on a weak or defective picture tube.