Have you installed the appropriate video drivers?

Which operating system version are you using?  Ubuntu? 

Sorry- I forgot to say its running Win XP.  All drivers are what came preinstalled.  I did flash the bios and today I replaced the RAM with a 2 GB stick, but the resolution problem started before the RAM transplant

Has anyone found a solution to this because I also have this exact same issue?

anyone??

The solution for me was to reinstall the video driver.  You can get it from the Dell Support website. 

Hopefully it will work for you to

One thing I noticed is that I started having screen resolution problems after I turned off the language bar.  Not sure there is a connection, but reinstalling the video driver after disabling the language bar is what worked for me.

well I reinstalled the video driver for the second time after speaking to dell support and I still have the issue!!

I need some help guys any more ideas??