680 Sli problem In need of help

[Fantasticcg]

Hey
Recently rebuilt my computer reinstalled everything correctly.
Having issues.
In windows the Nvidia control panel does not recognise or give me the option to enable SLI.
Both cards are shown in the bios.
When in device manager a yellow ! sign on one of the cards appeared
There is one over the high definition audio as well, but from pass experience this has never caused an issue with
my GPU's.

Things I've tried is reinstalling Nvidia drivers
Uninstalling the cards from device manager
Installing missing USB3 drivers

Did wondered if a complete reinstall will be needed?

[abvolt]

And you do have the sli bridge installed on the cards ?

[Arne_Saknussemm]

Best bet would be reinstall OS if you have moved OS over from another mother board or something like that. Though you could reinstall chipset drivers first.

Also I would not connect SLI bridge have the cards separate and reinstall Nvidia driver after starting up in safe mode and removing all things Nvidia with something like DriverFusion. Then when second card is recognised and set as PhysX card. Turn off attach bridge (maybe try another bridge?) and then set up SLUI....