What is the monitor?
Start with the vesa driver. If everything is OK, then switch to the "nv" driver. If it work with "nv", it should work with "nvidia".
To run these tests, just edit the driver line** in /etc/xorg.conf (You might also have to install the drivers--they will be in the package manager.)
**You'll edit this line (sample file---yours will be different):
VendorName "nVidia Corporation"
BoardName "Quadro FX 570M"