My CD changer (not Bose) on my 96 BMW 328i went out suddenly. The cassette loader (6 CDs) stayed stuck, i could not eject it. Because of previous performance record, I thought the CD changer was broken so I decided to look for a new/used one. A friend of mine who just bought a used BMW had one because he replaced his with a Bose one. The long and short he gave me his and installed it for me. It worked for 1-2 mins then went out the same way as mine did?? The loader cannot be ejected!! Do these changers have fuses?? What could have gone wrong??