Dell latitude 8200 screen problem

This is a driver issue. You need to install the latest videocard drivers for your OS (Probably XP) and that should go away.

http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=04&l=en&s=bsd&ServiceTag=&SystemID=INS_PNT_P4_8200&os=WW1&osl=en&catid=&impid=