Hi Vince and welcome.
Right try this.
Connect your VGA lead only.
Go into your screen settings, right click on desktop\properties\setting and set your screen resolution to 1280x1024. Then select advanced and then the monitor tab. Set the refresh rate to 60hz.
Then power off your pc & monitor remove the VGA lead. Connect the DVI to the graphics card and the monitor.
If the lead is fine then it should just work.....
Also in the nvidia control panel under display\change resolution make sure in there it says 1280x1024 @ 60hz.
---------- Post added at 18:09 ---------- Previous post was at 18:05 ----------
Nice link from Mr Help!
Last post, mentions VGA but might work for DVI