Help with Kenwood headset/cd reciever please

I have a Kenwood KDC-MP4028 type headset for my car. Recently I put a CD in and the Cd worked but next time I started my car the cd player would not work and wouldn't read the CD. It now wont read any CD's I put into it and I can't switch to the CD function at all. Does anyone know what could have happened and how to fix this? Is there anyway to reset the headset or anything? it won't read the CD's at all, you can hear it trying to but it just doesn't work. Any help is greatly appreciated.

It is probably in Demo mode. Check your manual for detailed instructions on how to get out of it. As for my kenwood, it was something like press SRC so you're on standby, then hold down MENU for like 2 seconds, scroll to mode, and scroll across off of demo, then hold down MENU for another 2 seconds... something like that

nah I tryed the demo thing that didnt work either...this sucks I think I'm just going to bring it into a car audio shop to see what they say.

how long ha thisunit been installed ?

usually the reset is under removable face plate, a very small button.