About 1 week ago updated to 22.04 and everything seemed to be working.
Did latest updates on Nov 4 and now get "no signal" message from monitor.
All cables are connected.
Can run complete memtest with no errors.
See normal start up followed by ubuntu splash screen.
Then black screen on monitor.

System is setup to dual boot windows 10.
Can startup this OS without problem on monitor.

Monitor is Asus LCD monitor.
From tag on back of monitor
VZ2791R Version No V2279HEG1R
DEC 2020