My friend borrowed my car and before he took it everything worked fine. But now nothing dealing with my CD player will work. It won't even eject my CD. He said he didn't do anything, he didn't even use the CD player but I don't know what happened. Could he have hit some sort of "sticky key" combination to do it? Please help! I just got the car and don't want to have to pay for a repair. I'm hoping it's a simple fix.