Question : Problem: Display not always drawing entire screen

I am using a mix of Dell GX-260 and GX-270's here at my work and one particular machine will be using any application and the buttons, message fields, etc, will not always display until you tab through the program or force highlight the entire application with your mouse. It's almost as if the screen is deciding to not refresh where specific buttons and text entry fields are.

Answer : Problem: Display not always drawing entire screen

Try shifting the resolution - some onboard aren't very capable so the top may be 1024x768 or even drop it as low as 800x600 to see what the effects are.

Also dell sometimes bundles graphics control software so check for a program like ATI, or CCC (Catalyst Control centre) and disable things like 3d refresh rates, or check if it's set more for quality than performance.

Third - Windows has this UMA buffer which I've never had problems with so never had to touch.
Hope something helps here.
Cliff