I just got a new video card nvidia geforce 7800gs AGP. when my pc boots up it doesnt even recognize it installed but just installs the generic graphics called SIS mirage graphics. I dont know what to do here i figured maybe the card wasnt getting enough power so i rearanged the cords but it still wont work. Also it seems like my monitor wont turn on if its hooked to the back of the card but if hooked to the back of the mobo it works. Now i have a older video card a ati 9800xt and i have no problems with it. I am very confused and dont know what to do plz help.