LG L245Wp and GTX 260 display problem

Hi,

I have a strange problem. I just bought a LG L245WP screen from a friend of mine and plugged it into my GTX 260 by HDMI -> DVI connection. It works, but the problem is that it's displayed off-centre. I Have 2 screens connected. The other is connected with DVI-->DVI and works fine, but the LG is not.

This of course is not a real picture of my situation, but just to give you an idea what I mean: http://t1.gstatic.com/images?q=tbn:A...SruWN2uVP8t42A

The left side is out of view and the top too (so I can't see the apple menu bar) . Does anybody have an idea on how I can fix this?

Help is much appreciated! Cheers,

Anybody any idea how to fix this?