Fedora should have a command
Code:
system-config-display
That will allow you to adjust screen resolution. Should also have a "screen size and rotate" somewhere in one of the menu's.
If all else fails edit your xorg.conf file to the proper resolution. Back it up first so you can restore it if you mess it up. I think it's somewhere like /etc/X11/xorg.conf. You'll have to be root to edit it. You'll have to quit X and restart it for the changes to take effect. Also learn the cp command first so that you can overwrite it if you mess it up. Sometimes you have to remove all other resolutions in the resolution line but the one you want to run.
Depth 16
"640x480 800x600 1280x960.....
system-config-display always worked in Fedora for me.