Appearance of Sudden White Screen

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http://www.linuxquestions.org – I have been using Debian 6 Operating System, Kernal Version 2.3.2 with DirectFB, XORG installed. When my system boots i gets EDID Invalid error message. Moreover when the system is left Idle, after few hours display turns white but all the process are running properly. and I can able to switch between terminals and view the contents in it. Only my GUI goes blank. I have tried by disabling kernel mode settings, Configuring GRUB and adding by Option "useEDID" "false" Option "IgnoreEDID" "1" tot xorg.conf but its of no use. Can any one suggest a solutio (HowTos)