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It is unclear which Alpine CD changer you have and what output connections are available from it.
However your Kenwood unit has Aux input terminals at the back. With appropriate cable connectors you should be able to hook the two up. In the Kenwood you will have to select AUX in menu when playing CD changer. Download user manual for Kenwood from this site. http://www.kenwoodusa.com/Support/Car_Entertainment/
Possible that the main loading or the front loading mechanism is struck or jammed. You will need a visual indication of the mechanism to confirm.If so remove the mechanism and reset, If not the loading driver IC is faulty or the motor has failed.
However if the CD is not detected the optical is not working,as there is no laser scanning and the possibility that the laser head can be defective. It is ideal to clean manually the laser head eye using a cotton bud with gentle pressure on the lens eye.
If the Kenwood is compatible with USB memory adapter, then you will have an USB port on the front side of the player, just aside the CD slot.
If the stereo is MP3 compatible, that does not mean that the unit is compatible with USB devices. If the Kenwood is MP3 but not USB compatible, you can play MP3 files burning them onto a CD, then playing the MP3 CD in the CD player.