Pc doesnot detect my new videocard

Dexter88

Honorable
Dec 21, 2012
4
0
10,510
Hello,
Why does my computer doesnt detect my new graphic card? (only my old onboard)
motherb: p5gc-mx/1333
gr card: xfx radeon hd 6870-zdfc
powersup: xfx pro 550w
os: windows 7