last week i ordered a Sapphire HD5770 1GB GDDR5 and the first moment i started the computer i got problem. I didnt get any image from the HD5770 but i got from my onboard graphic device.
Tried Driver Sweeper and new drivers. But nothing worked
did you uninstall the onboard graphic device?
During installation windows 7 you must have seen any display?
After that without installing the graphic driver you must see a vga driver
Do you have HDMI or VGA or DVI Start with VGA cable to see if the card is working etc etc