1600x1200 not displayed properly on SyncMaster 955DF

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Banned
Mar 27, 2002
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I hope this is not off-topic here; if it is, I'm sorry.

System:
Samsung SyncMaster 955DF (max resolution 1600x1200)
Radeon8500LE

Problem:
When I switch to 1600x1200 resolution, doesn't matter if it's on the desktop or in a game, it seems to stay at 1280x1024 (or something similar) and the rest of the 1600x1200 screen goes off the screen. On the desktop, if I put my cursor on the edge, it will move the entire screen over the the area that's not showing. What could be wrong here?