See Problem #5 https://www.tonymacx86.com/threads/solving-nvidia-driver-install-loading-problems.161256/
I found that copy/paste the command works where typing only brought up a blank nano
All thanks to a post by Brebro
I'm having a similar problem, I did a clean install of snow leopard with iBook legacy. Then I used the update helper and rebooted, used the 10.6.8 combo update and now I get that gray apple screen with no wheel. On -v it stops at [ PCI configuration begin ]. I'm somewhat at a loss.