OpenFirmware Problems

I got a ibook from a school when they upgraded to better computers. When it boots up, everything goes fine. It gets to a screen with a very light blue background and a cursor, and then stops. I can move the cursor, but clicking does nothing. I tried putting in a pendrive, and it didn't show up! Any ideas? I also tried the openfirmware thing, but it didn't do anything, because I don't know the openfirmware password. I thought about using the FWsucker program, but I can't, because it doesn't let me boot fully.