We just got Namcomuseum for PS2 and for some reason, we cannot play PacMan or Ms PacMan. When prompted to hit X for one person or the square for 2 person, nothing happens when either button is pushed. We are able to change options for these games but not able to play them. All of the other games (DigDug,Galaga,etc) work and are able to be played but not Ms PacMan or PacMan. We even exchanged the game and the same thing happens with the new game. Any suggestions?

I have an update on this question. I tried this game on a friend's PS2 and it works. The only difference is that their PS2 has a memory card. Both PS2's were new at Christmas (2004). Would this really make a difference or is there a problem with the Playstation? The Playstation works for every other game that we've tried and works for most of the games on Namcomuseum.Should I try using a CD cleaner disk on the PS2.