I recently bought a second hand CD43 to fit to my E36, and stumbled upon problems during installation.
I disconnected the battery, replaced the old unit for the CD43 and re-connected the battery, at which point I noticed the little red light flashing on the unit. At the time I didn't have any instructions to hand, and was trying to figure out how to enter the security code. As I didn't immediately figure out how to do so, I fed the unit a CD, to make sure it was receiving power. At this point it ate my CD and now refuses to give it back.
In fact, it now refuses to do anything at all, so I tried re-installing it, and now that I know how to set up the unit it seems to be completely unresponsive (no flashing red light, no signs of life at all.) Does anyone have any ideas of what to do? I'm pretty stumped myself, so any help would be appreciated.