Video card pci help!?

i have purchases a pci card for my main video output becuase my agp is burned out , i have a brand new e-geforce fx 5200 128 mb card nd i just put it into the pci slot nd pluged it in but still NOTHING COMES UP ON MY LCD!!!!!!!!!!!!!NOTHING!!!!!!!!! what im a DOOOING WRONG PLEESE HELP THANKYOU!