Thanks for the link, Mo.
I was given a Canon Speedlite 420EZ a few years ago, I could get one flash from it but nothing after so the communication between the camera and flash must be different, so I taped over all the connections on the flash except the centre one, connected it to the camera and nothing, I then let one of the pins come through the tape and connected it again to the camera and it worked so I disconnected the other wires inside the flash and it works every time now but only in manual mode but this is how I was brought up so no worries
