Simple straight forward install of Nvidia graphics drivers on Centos6

echo -e "\nblacklist nouveau" >> /etc/modprobe.d/blacklist.conf file [[or let the nvidia installer do the job]]
mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r).img.bak
dracut -v /boot/initramfs-$(uname -r).img $(uname -r)
init 6 [[and reboot to runlevel 3]]
./NVIDIA-Linux-x86_64-295.33.run -s -n -X --kernel-source-path=/usr/src/kernels/$(uname -r)/  [[use appropriate driver and also check your kernel-source-path]]