Is my HD 7850 toast?

[GIGGLEWITHQUIGGLE]

Hi,
In an auction I won a computer with a 500 Watt PSU, Gigabyte 78lmt-usb3, AMD 8120, and the problem a Powercolor HD7850.
When I unplug the gc it starts right up no problem. When I plug it in the screen is black but the fan spins. When I try Installing the new driver it crashes on me. I have tried uninstalling the old driver.

Any and all help is appreciated,
giggleconquiggle

 

[smeezekitty]

Are the PCI-E power connecotrs in?

 

[GIGGLEWITHQUIGGLE]

I have the on labeled PCI-E plugged into the card but then there's a 6+2 pin labeled SLI Ready on it.