I am running 5.50 GEN-B on a psp 1000 and I had no problem playing games on it until today. I put Disgaea 2 onto the memory card and it ran fine for around 10 minutes until it crashed. Since that game crashing every time I choose and ISO on the memory card the psp shuts down.

Any ideas on what's wrong?

Auto-Merge: It now doesn't shut down. When I run a game I get a message saying "The game could not be started.(80020321)"