another strange computer issue...mine is the monitor

I noticed everyone having strange problems, here's mine.

We bought our son a used computer today for $150. The computer is a Dell Dimension 2400? We gave him a Dell flat screen monitor The only problem I am having is I cannot change the screen resolution. I dont know a whole lot about computers, however, I do know that when you go to Display properties, you should be able to change the resolution by sliding the bar. However, the resolution is "stuck" at 640 X 480 and I cannot move it. Under the color quality, my only option is the medium 16 bit.

I went to Help and Support and it says to go to Settings, Advanced, then the Monitor tab and under that tab, I get the following:

Monitor, says it is the Default Monitor (I have connected 2 different monitors up and its the same for both monitors), the "Properties" button is gray and will not let me click on it for any other options.

Under Monitor Settings:
Under the Screen Refresh Rate: my only option is "Use hardware default settings"


Any Ideas on how to change the screen resolution? Its a Dell computer running Windows XP Professional. The people we bought it from said they haven't had it hooked up to the interent for about 2 years. I don't know if they have had it hooked up without using the internet or not in that time.:confused

Thank you so very much!!!

 

Looks like it needs the graphics drivers installed first (probably needs chipset drivers installed before that), visit the Dell Support site and fill in the details for the machine, download and install the chipset and graphics drivers (there may be more than one type of graphics card installed into that Dell range - best if you can get the Dell online and use the 'Scan my computer' option).

Dell drivers for Dimension 2400 (Europe)