The card will only fit in the PCIe X16 slot which is the longest slot on the board. The graphics will display video regardless of drivers, it will default to 2d 640x480 with basic windows drivers. It sounds like the card is not fully seated in the slot or there is a problem with power connections. Also your power supply must have adequate 12v amperage or it may kill the video card. If all those things are correct then you may have to start troubleshooting by swapping out graphics cards or power supplies etc.