It sounds like a wire may have come lose (assumeing you mean the vcr is built into the tv). You could just have a lose wire inside or whats called a cold solder joint. Cold solder joints are very common. If you know how to solder it would be very easy to check for the cold solder joint, just look for a solder joint that is dull and then retouch it. If you can give me the manufacture and model I will see if i can find more for you. For now just make sure all your connections are tight and try the tracking on your vcr. The blue screen will only appear when the screen is full of static.
.
