I finally have my TV powering on again. I bought the main board used so although the TV now comes on I can only see a "No Signal" message. How do I access the setup app. It comes up automatically on a new Vizio TV but this board is used. The user manual gives a good desription of the setup app but nothing about forcing it to come on. Likewise for resetting Factory defaults. It describes how to reset them but only from the on-screen help menu which I can't get to. Anyone know how to do this?