I bought a 1980 Vauxhall Corsa about a year ago. It has been fitted with a Sony Radio CD player by the previous owner. The CD is fine but the radio has not worked since I have had it - it just makes a repetitive buzz....buzz....buzz...buzz noise. The previous owner said they never used the radio and I thought perhaps the aerial was not connected properly but I have tried all the wiring including the aerial and all seems ok. Is there anything else I can try or is it a gonner? Thanks