My Monitor won't auto adjust when i change my resolution and refresh rate. My buttons on my monitor will not work (brightness, contrast, and auto adjust button).

Specs:
Dimension 5100
P4 2.8GHz w/HT
1534MB RAM (2x512)(2x256)
79 GB HDD
ATI 256mb x700 pro (ATI CATALYST 6.10)
Windows XP Home Edition SP2
1024x768 @ 60 hertz