that strange clicking noise is from the defrost timer situated on the back at the bottom on the left side of the compressor.White plastic housing held on with screws.in the centre is a round blanking cap.prize it out and then using a large flat bladed screwdriver turn the cam around and see if the compressor starts up.replacement timers are about £10.sometimes turning the cam round manually for 5 or 6 revolutions can make them work again but replacement is safest
ck
December 2009