William Sommerwerck explained on 30/08/2013 :
As far as I know, no monitor can be damaged by yanking the input signal. So
the "burp" while switching shouldn't be a problem.

The only way that I know of that a monitor can be damaged is if it's a
multi-sync model, and it's driven at a scan rate above its highest spec'd
rate. Other than that...

I know this is OLD History but-
The early text only green IBM PC monitors needed a sync pulse from the
CPU or they would "self destruct"
The monitor was powered from the CPU power switch so that it cold not
be left on alone.
Of course that is really long ago history. ^^

--
John G