My dual usb ibook doesn't seem to recognize the cdrom drive anymore. When I put a cd in it will spin up, but nothing on the screen. If I put a osx disk in and restart holding the option key, it gives me the option of booting from the HD or the cdrom, but will freeze if I try to boot from the cd. The cdrom is as far as I can tell made for apple, but I am not sure if it is the original. The model number is CR-176-M. I also picked up a sony CRX810E because I read somewhere that they were compatible with ibooks, but I still get the same thing. I am currently running os x 10.1.5, are there any drivers I should try, or is this something more serious?