You have to delete all Graphics Kexts first:
boot with -s
mount -uw /
rm -rf /system/library/extensions/NV* (enter)
rm -rf /system/library/extensions/Ge* (enter)
reboot (enter)
Your Graphics will appear in 1024 x 768 but , there you install the Zephs graphics installer with NVinject 0.2.1 (latest is very important)
then open terminal, your name & password and Sudo & Chown everything in extensions folder
cd /system/library/extensions/ && chown -R root:wheel * && chmod -R 755 * (enter)
diskutil repairpermissions / (enter)
reboot (enter)

Im not a "know it all" but this is pure basics... hope it helps
ps.. If you want to "mount -uw" again and run the ./patcher cpuid-graphics.txt for your convenience do it again