apple computer
what do I need to do I turn it on all I get is a file folder with ? in it
He did. That's what you have to do to get it up and running. You have no system on the machine. What Niel suggested to to reinstall the system. Not knowing what model Mac you have due to the lack of information in your original post all he can do is point you to the general methods as described by Apple.
This Apple document should be of help to you in the future: Writing an effective Apple Support Communities Question - Apple Community.
