pc wont recognise graphic card. Nvidia geforce gtx 470.

Hello. I just got bought a new Nvidia GTX 470 GPU and i have put it in my pci express slot and turned the computer on but it is not recognising it or coming up in the device manager. the fans are spinning but i get nothing through the card, I am having to use my onboard chipset.

Any advice?

Thanks
Barquest100

I have the driver installed but if i plug my monitor into it i get a blank screen and cannot see anything.

Its the most recent driver on the website. The thing is that when i put the driver disc in the pc it says it cannot find the gpu for the drivers. So i got the drivers off the internet but it doesnt seem to have paired with anything, I just almost need to make the pc realise the gpu is plugged in.

its a 800watt psu so its plenty for the gtx 470. and the fans are spinning etc so i know its got power. :/

i have disabled the on board graphics and it has changed nothing,