Samsung Syncmaster Goes standby

i recently bought a new pc: c2d 2.93Ghz on a gigabyte mobo w/ intel G41 chipset, a 320 Gb WD-HDDsata, an LG dvd multi drive. problem is when i install the graphic driver after restarting the monitor goes standby or blank but the cpu itself is working ok. now i try to uninstall the graphic driver from safemode and the restarted again its ok. I even try downloading the driver from the intel site but just the same