graphics card not giving picture(gtx 570)

[Mikachu]

i got a new graphics card,the gtx 570,and when i turn on my computer and start it it doesn't give any picture but the fans are spinning.And the gpu is not detected in device manager... i have a 600w psu and a amd phenom x4 840 3.2 ghz,6 gb ram...
help please

 

[Techonyourfingertips]

Was their A PCI-E slot for you to plug a PCI-E cable into. Check.

 

[Mikachu]

Was their A PCI-E slot for you to plug a PCI-E cable into. Check.

i dont understan you, my gpu needs two 6pin cabbles and they are pluged in,and every cable is plugged in well,but its still not giving any picture