Is the jumper in configuration mode before you power up?
That graphics card is power hungery , check the specs on the PSU and make sure it has enough AMPS Per rail for the card , question is your card two 6 pins or 1 6 pin and 1 8 pin ? I checked you need two 75 watt 6 pins . If you plain to crossfire later they recomend a 750 watt PSU /??