I just got off the 4th call today with either a blue screen of death or a screwy video settings.
1) roll back the driver.
(Device manager>display adaptors>right click on the display adaptor. choose properties on the driver tab choose roll back driver. reboot.
2) go to dells website under support solutions then put the PC serial number in the service tag field. go to downloads. download the driver install reboot should be OK