I wouldnt think so, but if the video card was shorted or compromised by the CRT/circuitry failure anything is possible once it hits the motherboard.
Hard telling what other mod's have been done to the wiring. The monitor should be on its own fuse. Simple enough to totally disconnect that monitor and borrow another to see what is happening.
If you need to replace the video card, the era the original video card was from used a character set in a location that new video cards no longer have. You will need to look for legacy cards so the display text looks proper. I've found a software patch, but it doesn't work all that well in the edit screens. The most basic cards seem to work the best. Nothing high end. I'm sure Milltronics would still supply something $$$$.