Help! I think my FBUS cable is broken!

When I tried to test my FBUS cable by connecting it to my 3310, the phone's speaker made a click sound. I thought it might just be a connection noise becuase of a certain voltage being applied, but it happened again and again, every few seconds. As far as I know, nothing has been damaged, but could this mean that my FBUS cable is damaged? Could this be the reason I can't use it to flash? I've also tried my combination F/MBUS cable to flash, but to no avail. Any help would be greatly appreciated!