Screen Of Beginning Of Eternal Session!

My iBook doesn't start up, he stays in the screen of session beginning and he doesn't enter.

Some suggestion before to give format to the disk and to install again?

Thank you.

#21422

can't help man, i'm a ****ie with OS X, sorry

see ya

#21425

After sounding in some forums, and of carrying out several possibilities, anything worked, therefore I prepare to reinstall again.

Thank you.

#21434