by default , when you install x11/xorg you get twm window manager....
have you installed ati (x11-drivers/xf86-video-ati) driver?
(when xorg configuration popped out, you had to check the drivers you need)
in your xorg.conf
try using vga and vesa, see if that works....
try installing radeonhd (x11-drivers/xf86-video-radeonhd)
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