Monitor issures

[Blacksmith]

I have kind of a weird situation here and hope somebody on the forum can help.  Let me say that it has been quite a long time since I've been on this forum or have messed around with Mame or my arcade game.  That being said, I have a Mame machine that I have had for quite some time now.  I really have not turned it on in over a year, although my kids bang on it from time to time.
I turned it on the other day and wanted to play world class bowling (kind of a cool game) and noticed a monitor glitch that my kids tell me happens EVERY time they try to play the arcade machine.
It seems that ONLY when the machine is in game mode, or actually playing a game, the game will cue up and they every other second the monitor flicks on and off.  In this particular game, as soon as I touch the track ball to set the bowling ball up for the shot, the screen flicks off, then comes back on.  Then I roll the ball and the screen flicks off, then on, etc...
I originally thought it was some sort of a track ball issue, and took the whole thing apart, then reassembled it. It was pretty filthy, but cleaned up nice.  Turned the machine on and still have the same problem.  (rule out the trackball)
Got out of game mode and machine works fine in windows.  No issue with monitor flicking on or off on the desktop.
Got back into Mamewah screen to pick a game.  The Mamewah screen with the game menu works ok with no monitor issues.  As soon as I go into game mode, IN ANY GAME, the screen flicks on and off.

I have a wells gardner D9200 monitor (about 6 years old), arcade VGA card, ipac, opti-pac, and running Mamewah frontend.

Seems like mamewah is the issue here, but I don't know zip about it.  I had a guy load it up a couple years ago that was pretty versed in the setup, but he moved away and I'm kind of on my own here.  I'll try to stumble through this, but hope the group can guide me.
I did a little research on this last night and figured maybe the Tri-sync utility program was never run.  I downloaded it and ran it this morning and no changes.
HELP please!

[Ummon]

Well, I see no one has responded with anything yet. Sure is a weird one. I suggest you're going to have to slog in the mud with this one - ie: learn how mame and native resolutions work, and troubleshoot from the command line, as well as check out the basic functioning of your computer.