I was trying to boot up from my Snow Leopard disc last night to run Disk Utility (to repair my hard drive). I pressed C while starting up but it took me right to my login screen. I did this several times, no luck. I'm using a 15" MBP btw. I also tried the same thing on my sister's MacBook (using her own install disc) -- same thing, straight to login screen. I know pressing C used to work before because the MacBook used to belong to me and I did an erase & install before passing it down to my sister. Is there anything I'm doing wrong?