i do not work on mandrake but RH.. so cannot help u in full but HEY! they all are linuxes
u r a good observer and sincerely want to solve the problem...
what i gather from the messages u have sent is that your video card is not properly configured... the driver is not properly loaded..
so now u shud know what to do
and do not worry buddy. eveything has a start. u will soon be solving other people problems.. so don't feel discouraged...