A:Answer Hi,
Congratulations on your new 50" Roku TV. There is a combination power/input switch on the lower left side, slightly behind the bezel. Let me explain how they work.
For Power function - Press to turn on your TV when your TV is off (in standby mode). Press and hold to turn off your TV when TV is on.
For INPUT function—Quickly press and release to open the INPUT SOURCE list, press one or more times to select a video input source, then wait a few seconds. Your TV switches to the source you selected.
We hope you enjoy all of the features on this great set.
Arely R. - Insignia Support.