what do you mean by 'not working'? is the stereo powering on, but all you're hearing is static? or isnt it powering on at all?
if it powers on and all you're hearing is static, try scanning through the frequencies as the stations may not be on the number you think they should be on.. for example on mine (not sure why) everything is offset by something like 18MHz.. so Radio1 is around 80.00MHz, not 98.0..
not sure why it does it, and background info would be interesting.. but its worth a shot!
just an idea!