MSI nVidia 210 in Z4 G4 Workstation

Hi,

I just received an HP Z4 G4 workstation without a graphics card. As I don't need that powerful graphics I decided to use an MSI nVidia 210 that I had lying around. With this card correctly inserted in the PCI-E 3.0x16 slot I get nothing on the screen. I also tried another older card and got the same problem. Is this computer not supporting "unprofessional cards"?

How do I proceed? 

Thanks,

Jesper Larsson