Ms. Pacman Monitor trouble

My ms. Pacman (upright) machine was working perfectly. I needed to get inside to change the switch settings. I changed the coin credits and number of ms. Pacmans. when I turned it back on, I got nothing but white verticals lines and dots moving rapidly across the screen. There is some garbled color on the right side. in self test mode, i get the random colors covering the screen, then it turns to vertical red and white lines moving rapidly. The game and sound is working, I can hear ms. pacman moving and eating dots. I just moved it down a flight of stairs and it was working fine. I barely moved it to take the back off and now its all crazy.

Any ideas??

Thank you for the response, it turns out one of the chip boards and been bumped a little loose. pushed it in, and it works great!