My speaker is not working

Well, if you provide some more specific information to your problem, I can help you out some more.
 
we could provide some information based on 'my speaker is not working'

disconnected wire is usually ALWAYS the cause.
could be a wire on the back of the speaker.
could be a wire on the back of the speaker box.
could be a wire on the back of the amplifier.
could be an electrical trace inside the amplifier.
could be an electrical trace inside the voice coil.

maybe a shattered magnet on the speaker?
 
Change leads of the speaker wires meaning right to left and visa versa. See if it is the speaker or something else.
 
another one that knows how to wrap a voice coil?

but yeah..
maybe the amplifier channel is blown and the other one still works.
 
There is a web site called Fix It try them.I would take it to an reputable repair shop in your area and have them look at it.