Betson Imperial 27 in ( Kortek KT-2914) screen flicker

[big daddy]

Using Ultimarc Arcade VGA.  Haven't touched this stuff in years (the workings of it anyways - play it all the time) so don't even remember how I have it all configured :-) 

It was working fine then all of a sudden started flickering.  Tried restarting and degaussing but no help.  Tried restarting in safe mode and it's flickering even the text as windows is restarting.

What's weird is that when I open up file explorer the flickering stops.  But close it and it starts again.  Here's  a link to a video that shows that behavior:

Also noticed that even when PC is off the "connect monitor" message also flickers, so it's not anything "Windows" related. 

https://www.flickr.com/photos/38002151@N02/34794256634/in/dateposted-public/

Any ideas?

[mourix]

Looks like some unstable screen voltage. Either capacitor or flyback transformer related, as my first guess.