If you get this errors, openSUSE will not be able to start the XServer. So, you will be logged on to the console instead of GUI. To fix this issue, you've to modify the XServer configuraiton file i.e.; /etc/X11/xorg.conf file.

1. Locate below code in the file

Section "Monitor"
HorizSync 30-38
Identifier "Monitor[0]"
ModelName "800X600@60HZ"
Option "DPMS"
Option "PreferredMode" "800x600"
VendorName "--> LCD"
VertRefresh 30-61
UseModes "Modes[0]"
EndSection


Section "Modes"
Identifier "Modes[0]"
Modeline "800x600" 38.85 800 832 912 1024 600 601 604 622
Modeline "800x600" 38.22 800 832 912 1024 600 601 604 622
Modeline "800x600" 35.50 800 848 880 960 600 603 607 618 +HSync -Vsync
EndSection


Section "Screen"
DefaultDepth 24
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection

2. Remove modes completely from the file and restart your machine or run "startx" command.