I'm using a X1950 Pro and currently have my 15" LCD on the VGA output of the card.
I recently got a Dell 24" and then tried attaching it to the DVI input.
The moment I did that, Windows no longer recognises my 15" LCD and the 24" becomes the primary monitor...the 15" kind of banishes into limboland. Until I had to do a Goback recovery to reset everything.
EDIT - what limboland means is that even though I disconnected the 24", windows xp no longer displays to the 15" (it could be a port issue rather than a lcd issue)
During this testing phase, I hope to run both concurrently (clone mode?) , ie not in an extended desktop situation, but each showing the same thing. This is to compare the output on both LCDs with a known parameter.
Anyone can help?