that sucks, I have no clue
it sounds like the changer is damaged or a part inside is broken
Did it work before after the installation was complete?
at this point I would disconnect the battery, just disconnect the black wire, and wait a few minutes, then connect the battery again.
maybe it needs a reboot like a PC, but like I said, not 100% sure what's causing it
Sorry if this seems like a somewhat stupid queston but did you hit the eject button and slowely try to eject a cd out of all 6 slots? Does it make any whirring/clicking noises when trying to eject a cd with no cd installed? Finally before install was there any noises from the unit like somebody sticking change/coins/fod into the cd mechanism?