Resolution in Mandrake

Im trying to config my resolution in mandrake linux. I never hard a problem
in slackware. mandrake is soo easy to set up easier then MS windows. However
although everything works great

I cant change my resolution from this larg 480x800 I want 1200x1600. My card
is suported I have a ATI radion All-IN-Wonder. My DVD player/mpg decoder
card along with TV decoder card is working. Its just this damn resolition. I
used "XF86config" READ I JUST used "XF86config" and it does not work. How do
I config my resolution

-Monitor Checked
-card checked

Please help
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