I just got a Macbook that needs to be reformatted for a new user. I tried rebooting into recovery with command + r and all it did was go back into the login screen. Then I tried re-installing Mac OS 10.6 with the disc and reboot while pressing c and it stopped at the grey apple screen and doesn't change. I tried restarting again with the c key press and did the same thing. I left it on overnight thinking it was just taking a while to load the cd, but no change.