Isis FrontPage disappeared

I have a website that was completely set up and running fine. Then all of a sudden, the Isis frontpage disappeared and reverted to a blog post. I have tried to restore defaults and begin all over for the frontpage, but it will not show. I have read all support and followed to the letter and the frontpage with the slider and boxes still will not appear. This is for a client and they loved the them until this happened, please help.