I am assuming that you are using cable and not an aerial/antenna.
On your concern "...channels do not tune...correct channel numbers...", it is possible that when you re-tuned the TV your setting was set to AIR or STD, try to re-tune again but this time pls verify that you are in CABLE mode. If on the other hand you are using aerial/antenna, then it is the other way around.
Channel 0 would automatically be your Audio/Video (which is where your DVD/VCR is connected). If you re-tune, chances are that Channel 0 ) would be back. To be on the safe side, pls power on likewise the DVD/VCR.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.