" Your monitor did not report its X,Y values, do you want to enter them Manually."
I solved the problem this way on my computer:
I looked in my owner manual for the monitor and found that the screen size was 310mm by 230mm. I wanted resolution=1024x768 16 bit
Go to monitor and click on properties and then 'expert' tab to enter
'Check desktopGeometry' values as (X-310, Y-230). And also go to 'Colour
and Resolution' to change colour bit and resolution to resolution=1024x768 16 bit. Save and exit
'sax2'. Reboot system or restart X server.
Be prepared. Create a LifeBoat CD.