Hello again Tulli.
I have pretty much solved all of my problems, with thanks to you.
However I have one final issue, which is very annoying. I think it is an EDID issue but then again I am not 100% sure.
I set up my 2 sources Flat Panel HDTV (via Denon Amp) and my syncmaster monitor ok.
Now though, with this setup, when I turn off the amp or change from the AV Amp input on the TV to Cable etc my monitor which I still need to use for other things gets messed up and ends up reverting to Extended mode. This has the effect that I cannot use it.
I have to go into Personalise and then Display in Windows etc or Catalyst to mess with 'Preferred' display etc.
I did have it how I wanted it a while ago, but have done much messing about since then to get the audio sorted. Which I have now, thanks!!!