ok so i have a dell dimension c521 and needed a new graphics card so i got a gforce 9500 and it was to big to fit in my slim line case so i took it back and had to order a xfx geforce 9500 gt low profile with the low pro xfx kit to make it fit guide said to uninstall the other graphics programs so i did and put the new card in and power up then run the disc the card came with but when i power up i get a black screen any one know why ?