Well it seems the issue lies with frequency Xorg is putting out. During install Xorg uses 60hrz, but when your system is up Xorg in SUSE linux uses 60 , 70 or 75hrz but is actually only giving you 59hrz when 60hrz is selected. Some monitor's like my ASUS have issues with non std frequency. Apple cinema displays & ATI graphics card arrangment produce issues also.