This problem is a moving target.
Now I can boot into TUI mode and go into VASM, but no matter what video mode I select, my monitor shuts off without any video signal on the very next boot.
It looks like the only way to get around it is to do another complete reinstall of VectorLinux, to try to "clean up" whatever got messed up, and to hopefully "fix" the "undefined video mode" problem that returned a couple of days ago, even in VL 6.0 Light.
Am I willing to do *another* complete reinstall of VL, to start all over again, without any new ideas for how to solve the problems that keep plaguing me?
Once burned, twice shy. Thirty times burned....