|If the display is blank, what's the point of inserting the driver disk? You don't need drivers to get a display.|
The HD 4830 is a high end gaming card & requires a lot of power. You need at least a 450W PSU with 30A on the +12v rail. If you're still using the factory Dell PSU, it's probably too weak to support it. Did you connect the 6-pin PCIe plug to the card?