Wij said:It's connected so that it has power. It was working but I took it out to work out why the front-left speaker had stopped working. When it came out though it completely lost all power. It should have a little LED on the main unit at all times. A black wire, presumably Earth, seems to be hanging loose between the wire adaptor (it's a peugeot) and the car's input sockets. I don't know which hole it came out of.
It's not the car's audio fuse as there's power to all the wires but the stereo won't switch on at all.