My father-in-law accidentally thew away his instructions. I am not familiar with this model or lingo so had my kids try to help. In attempting to hook it up they went to options and figured whatever they programmed in they could go back and change back if it did not work. There was an option of same type of set up with something running through and they said yes and we lost constrol of all setup control with just a blank screen and it will not do anything now when you hit set up. How can we undo this? Is there a way to get a copy of the manual?