I'm sorry to hear of the problem with your CD player in your Malibu Maxx.
Please try this: Press the eject button on the CD player. Turn the power off, then on again, then press the eject button on the CD player. Do not attempt to force or remove the disc from the player.
If the problem persists, return to your GM dealer for further assistance. If the radio displays an error message, write it down and provide it to your dealer when reporting the problem.
If you have additional questions, please feel free to contact me.
GM Customer Service