Earlier today i was working on a program when my entire mac froze. So i shut the computer down and tured it on. It got to the login page and i login then it does nothing for like 5 minutes and then gos to a blue screen for a second and goes back to my login page. It loops no matter what I do and cant get to my desk top. I tried to go into the safe mode and i typed "exit" to see if that would clear it up but its still doing it. I also tried to hld SHIFT after logging in but nothing, someone PLEASE help!