The computer ask to be power off after a brief time?
After reinstalling the operating system the computer ask to be power of and doesn't let you do anything after that.
Another weird thing is that the original system was in Spanish and even after formatting and reinstalling the operating system the fresh install operating system comes out in Spanish again.
I even reset the PRAM before doing anything and after booting with the OS X installation CD everything comes in Spanish.
I've never seen anything like this.
One last resource I'm going to try is removing the hard drive and formatting it on another system.
Is this a good question?