X works from CD - won't start when installed

[bilzer]

Installing on Emachine 384mb ram 1.8ghz
graphic mode works fine from Knoppix CD.
Installed system cannot startx altho selected to start graphic mode when dong the install. (have successfully installed on an older machine).
When using startx, message is "fatal server errror no screens found"
Tried xf86cfg
Message "fatal server error. XFree86 has found a valid card configuration
Unfortunately the appropriate data has not been added to xf86PciInfo.h"

Any ideas appreciated.