This could be due to ur Ram, switch off and unplug pwr from the wall socket, and then earth urself to the PC by holding on to the metal casing, now remove the RAM sticks and rub the gold metal where it plugs into their ports with a rubber erazer, what this does is it get's rid of the static electricity on ur ram stick's, replace and reinstall the pwr to the PC and reboot, thing's should return to normal for u...
cheers
zipperl, December 2009