Mazda 6 CD changer defective

Hello first, I’m new here, hope someone can help me… So I’ve been a Mazda 6 Sport Kombi 2.0l Diesel Bj. 2004 A super nice car! Only working a few days are no CD ́s anymore. I had 3 CD ́s ind the changer. When I started the engine the CD changer gave me one CD after another. I then pushed LOAD and made one again. And now the problem: –> he doesn’t give me the CD anymore. –> he plays the CD again. he doesn’t accept new CDs –> he doesn’t respond to the eject button anymore or LOAD… Maybe one of you has an idea what could be there and how I can fix it. Then another question so by the way: Does anyone of you know if it’s possible to make the Mazda Mp3 possible? A Mazda dealer said that would only go from the facelift model. Thanks in advance for all of you answer!