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Go to command prompt and cd to /etc/X11/xorg.conf. Save a copy of the existing xorg.conf (e.g. cp -p xorg.conf xorg.conf.20090409).
First try changing display: In desktop go to System-->Administration-->Display. See if the drop down for resolution has choices higher than 800x600. Also if the other drop down shows "millions of colors" you may need to lower it to "thousands of colors" to see higher resolutions. Changing settings here will update your xorg.conf and require you to logout (end your desktop) and log back in.
If you have any issues you can go to command line and copy the saved xorg.conf over the new one and restart.
If that doesn't solve it: On console run "/usr/bin/system-config-display".
Go to the hardware tab and find your monitor and video card. (Video card is probably already set.)
Note: Both the above save a copies of xorg.conf but a second edit would overwrite original - saving manually as indicated at beginning means you can get back to where you started from.
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