So I upgraded from a Radeon HD 4600 card to a Gforce 9800 gt. I have a Dell Optiplex 755. Now when I install it, make sure the dvi adapter is connected. Power up and monitor sits at a orange circle and no display. The tower sits at a green power light, with a 2 4 alert light but works fine with other card. This has happened when i had the original 4600 set with a different dvi adapter on. The 9800 dioesn't have a normal vga port. Anyone hear of these 755's having issue with digital cards?