and your saying that it only does not work when you put in the PCI GXF card right? if so then please connect your moniter back up to the VGA port out back and then load ur o/s then install the driver for this card then reset your pc etc... power down ur pc, put in ur PCI GFX Card connect it up. If you go get ur screen showing info eg, start up text etc... then go to bios, disable your VGA and then make sore that ur PCI Express card is enbles on there and then save changes and then wala.