Display problems

Hi,

Im having problems with my display(Desktop 1). I just installed Sierra and installed the Nvidia web drivers.

If I use nv_disable=1 I get Gigabyte GeForce GTX 750 Ti 0 MB in about this Mac.
If I use nvda_drv=1 I get a garbled display(see picture below).

If I hold power button for a few seconds and press enter the PC shuts down as normal with the garbled display. So I know it's at the desktop.

I've also tried setting inject nvidia to false but same problems.

I've attached my...

Display problems