You didn't give the model details. Instructions for resetting Home Mode may depend on model and are generally found in the "Plug & Play" section of the user guide. Don't let go of the volume button until you've pressed Menu.
Recently my dad took the TV off the wall to move the wall mount. when he put it back on and hooked everything up the TV has been on store demo mode (TV details on the left side of the screen). Ive tried pressing the volume button and holding the menu button on the TV for a period of time(as suggested on other threads) , and still no luck. What can I do to get the store demo mode off?