Thank you for your post. I was just wonder unpon installation of the the VGA card that you have bout and when you power it up again, is the monitor cable is it connected to the Intel port or the new VGA Card Port. You will need to connect the cable to the NEW VGA port and power it up again.
On another note, you may want to check the Card Positionning. Try taking it out again and inserting it again see if detects then.