Ok , the problem just happened today for no reason ... I have 2 display hook to my PC 1 -HDTV samsung with VGA connector 2- dell 19"FP with DVI connector I 've already done everything , reinstall video card driver/monitor driver but My Dell still show standby mode The problem is , It still fine when running at : dos screen (windows booting screen ) , in windows safemode , or uninstalled my video card driver (Nvidia 8800gts 512) and even hook up my dell with VGA connector . Its all fine , just can't use DVI connector . When I checked in Nvidia control panel : Wtf ? That place support to show DVI -PC display not VGA - PC. , somehow it set output to dell display as analog.I dont think its hardware problem because my Dell monitor still works in one way or another , so I assume Its because the driver but I already clean sweep ,fresh install and still ..