Monitor problem

Hi all, I don't post here in tech much, so bear with me please

I have a 6 slot at work, and for some reason when there is lots of action (I.E. - movement) on screen, it starts to shake like crazy. Vertical lines that are real jagged and bounce like nuts on the screen. This happens with every cart I use, not just one or two games.

Now I don't know much about the technical side of this hobby, but I'm thinking it might be a loose chassis (sp?) connection. Does this sound about right to any of you guys, and if so, what should I do to find out for sure?

Thanks for any help.

Q-

How much Access to you have to this cab..?

Can you open it and work on it..?

I figure it would be a loose Chassis Connection if you could get the Monitor to shake on screen by shaking the cab..
Does this happ during demos or during gameplay?

If you put the cab in hardware test and shake the cab do you get any break up on screen-Shakiness?

I'd clean the carts and Mobos Connections..(Rel Well)..and the edge connector.

Try just one game in the cab and see if you get the screen-Shakiness.
I'd also check the Monitor Adjustment Pots..Sometimes they get worn and can cause shakiness in the monitor.
Maybe a ground wire to the Monitor came off..

Well,If you could test some other pcb in it and it worked ok it could be the mobo..

I'm always thinking Power Supply..It may be just a tad to low or starting to go bad..

Tries to help..Waits for ttooddddyy

First thing to try is adjustment of the horizontal and vertical hold pots

I'll try these things sometime this week. I'll work my way through each one.

Thanks for the advice guys. I'll let you know if I can find the problem

Thanks again,

Q-