Mac OS not loaded properly

[Crosby]

When i turn on the computer I see the white screen with the Apple logo and that it is loading. After some minutes the computer turns off and I cant access anything. This happening because os not load properly. How to solve this problem ?

[MACY]

Try booting in Verbose Mode (command + V at startup in OS X), and see if that sheds any light.

[Maceo]

You could try booting into verbose mode (hit F8 at boot and type "-v"), then you might get some idea of what's going .