Make sure that it isn't already full. Try ejecting a disc. Go to disc select. Choose any one slot. Start with 1. Try to eject. If no disc comes out, then press and hold the load button. It should take a second to line up. It will tell you to load, then place the CD in the slot. If you continue to have issues, it may be broken. But I would join a Mazda 3 forum to get more info and more out of your car. http://www.mazda3club.com/