Having problems setting up XFree86

I just installed Linux (Redhat 4.2), I have an ATI Rage 3D graphics adapter, and have gotten XFree to work. Unfortunatly, it will only run at 640x480 and there is a one-inch margin on all sides of the screen! Any suggestions?
duffybAsked:
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ahoffmannCommented:
Check your  /etc/XF86Config  for:

  1. Modeline in Section "Monitor", (should have others than for 640x480)
  2. Modes in Section Screen Subsection "your monitor ID" (should also have others than 640x480)
  3. if above is ok check output from startx (switch to console tty with Ctrl-Alt-F1)

Good Luck
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