The jack is probably broken, as it was a school owned laptop, a student could have pulled the headphones out the wrong way and broke it.
Dark Forces! At first I didn't like DF due to the PSP ruining the experience with awful lag.But running it smoothly at high res. is fun!
Also got the game Abuse which runs well too, Marathon was a PAIN. There was no lag in marathon but there was no escape/pause menu to fix controls so I was forced to restart.
One question, has anyone ever heard a horrible noise through the iBooks headphone jack?