Having taken a look and tried different things, I think that it's the noid that's gone or the wires from/to it. There is no click with eyes on or off, certainly not the noise that I had with my last DM.
The wires connecting to the board have started to go through in such a way that you can see the metal, so that might be affecting it.
Anyknow know if a replacement is free?
Thanks for the help chaps.
Yea Slim, this is the one that turned up today.
PS Skeet your site is down dude, incase you didn't know.