Has anyone ever had this happen to them, I have a Ms Pac that the screen looks almost like it's turned into a "negative" of the screen output... the background is primarily yellow-ish green. Would this be more of a gameboard issue?
It seems all the other colors are still there. It looks to be a monitor issue to me. Have you tried adjusting the green on the monitor? It looks like the green is cranked way up.
I recently had one where a color was on all the time and it ended up being a cracked neckboard. The crack wasnt all the way through and was only visible after I removed the cardboard cover from the back.
Interesting new development... today I went to the location and plugged in a new monitor to test, and only got blue. Plugged the original back in, and same original problem exists. I think I have a gameboard problem.