2005fpw analogue problem

I have had a 2005fpw for now but recently have tried using the analogue cable when I do the horizontal pixels are stretched so the picture is wider than the monitor and to get the rest of them I have to move my mouse to the side and it scrolls across to show me the rest of the picture but loses the opposite side.

If I select 1:1 ratio in image settings on the monitor it does the same but instead of stretching the image is displayed with black bars down both sides and the image as before cut off in the centre.

Anyone know why this may be?
I was thinking it may be that the cable supplied with the monitor by AUT is naff?

At what resolution are you trying to run the display?

Suman