Possibly. Is the card very old? The spec for it should give the maximum resolution it can output. Maybe there is a software upgrade for it you could download.
If you post the make and model of video card and monitor it will give us more idea of what you need.
Have you 'detected' the new monitor after plugging it in?
On Windows 7 if you go to 'Control Panel > Display > Screen Resolution' then click 'detect' it will identify your new monitor and possibly give you a new list of resolutions to choose from.
If this doesn't solve the problem then it is your graphics card at fault.
Further info I updated the drivers for the monitor and the recommended resolution was added to the list,but when i clicked it it was at 60Hz but it moved to a lower resolution and 30Hz ??? Next step i am changing the monitor cable from Vga to Dvi and the the graphics card Any more advice on this would be of help
OK thx AOC e2343F Monitor and ATI Radeon HD 4200 card and also guys when i play the suplied CD it only plays the introduction and not the main information Is this part of the same problem.