ZENITH REMOTE POWER BUTTON - Use to turn on your TV TV BUTTON - Selects the device your remote will control.  If your TV does not turn on make sure to select this button FIRST before selecting the power button. TV/VCR SOURCE BUTTON - Use to change the source of the TV so you can go between different input sources.  Your TV/VCR SOURCE BUTTON is a toggle button so you must continuously push the button to get to your desired source.  When the desired source is found press ENTER.  Source - S-Video Digital Set Top Box - lets you access streaming video, live video, and cable Source - Rear Computer SVGA Computer - displays your computer on the TV. Source - AUX Video DVD/VCR player - so you can play DVDs and VHS tapes. Your TV/VCR SOURCE BUTTON is a toggle button so you must continuously push the button to get to your desired source.