Desktop Won't Fit To The Screen

OCuser

Distinguished
Mar 21, 2003
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I've just installed Suse 9.1, but I'm having trouble displaying the whole desktop in the monitor. I want 1600 x 1200, but for some reason the display won't fit in the monitor unless I set it to 640 x 480. I have to scroll to the right, left, down, up. to see the rest of the desktop.

I have a ATI Radeon 7000 and a Samsung SyncMaster 955DF

Thanks in advance.