ok one day my xbox was working fine then the next my xbox would'nt power on.does anyone know whats wrong with it and how to fix it.
My friend I am afraid that no one could answer your question here, beyond telling you to make sure the power cord is plugged into the wall outlet, as there are no other symptoms or codes to work with. You could take it apart and look over the internal components to see if it has any internal damage.
Check all the caps for leakage, also if your hit the power button and it's dead as in no fans are spinning, your probably looking at a powersupply replacement, hopefully no more then that!.. Like shademand just said, if there are no code errors then your going to have to look over the board, I would start with the powersupply, good luck..