I'm having the same issue as xenophex.
After updating to 10.10.5 from 10.10.4 my graphics no longer work unless I use nv_disable=1.
I have a quadro 2000m and it was working fine. I have tried updating the web driver to the last and also tried the beta version but still getting the same issue.
My smbios is macbook pro 8,1.
Any one any ideas what might fix it. Do you think I could force the old drivers back on to the system.
Update: I uninstalled the webdrivers and rebooted. The system booted to desktop.
On booting it said it was using the web driver rather than official even though I removed them.
In Extensions it shows that no nvidia driver/kext is loaded.
Im pretty confused :s
I got it working using the old beta drivers off 10.10.4.
I used NvidiaWebModder.sh to set the package to usable on 10.10.5.
I then installed the beta drivers and after the message came up saying that I was using incompatible drivers and would be forced to use OSX official drivers, i then ran Nvidiawebmodder.sh with the -skip-verification flag.
After a reboot the system came up using the nvidia web drivers