Originally Posted by Hengis
Hi there and welcome to the site.
The resolution settings are not set by the monitor but by the graphics card within your PC. Can you give us the system service tag for your Dell and we'll get you the correct drivers for your graphics card. If you also post the make and model number of the monitor, we can see if there is any software required for it too.
service tag:FQ8M331, (DELL, OpitiPlex GX270)
Monitor: E771a (belonged to an older DELL-Dimension)