what do you get the problem with ie an original ?? or backup if youre 360 isnt flashed and hasent been touched youre gonna need a new laser if it is flashed it could be something diffrent i.e firmware problem / burning issue / bad iso etc we need more info .
hi mate is it a new backup youre using if so could it be burnt correctly ?? if youre unsure try a game that you know definetly works before you started getting this error if that dosent work its gotta be that the console needs a new laser fitting cheap as chips from ebay etc and easy to fit .