Is that OpenSUSE 11.3 ?
if so is is way past it's End Of Life
and so is OpenSUSE 11.4
11.3 went EOL on January 20th 2012 , over a year ago
currently opensuse is only supporting
OpenSUSE 12.1 and 12.2
on 11.3 Are you using "evergreen" ?
if so what was in the last update ?
i am betting a xorg update
Are you using a propitiatory ATI/AMD driver ?
Or a Nvidia driver ?
Boot into the terminal and have a look at
--- or ---
and see what was installed