You seem entirely unable to post your configuration or logs, mfaridi. Why?
I took the time to track down a manual for your monitor. If you have not already seen these, the specifications of interest are:
Code:
Sync input: Horizontal 30-98 KHz, Vertical 50-160 Hz
...
Resolution: Max flicker free VESA 1600x1200 @ 75 Hz
Recommend VESA 1280x1024 @ 85 Hz
...
Preset modes:
Resolution Horizontal Freq Vertical Freq
VESA 640x480 43.269 KHz 85 Hz
VESA 800x600 53.674 KHz 85 Hz
VESA 1024x768 68.677 KHz 85 Hz
VESA 1280x1024 91.146 KHz 85 Hz
Without more information from you, I will not be able to help you any further. Well, I might not be able to help even with more information, but without it, no one will be able to help you.