Press the Home button on the Roku remote
Go to Settings
Select System
Select Power
Select System restart
Select Restart
Wait for the Roku TV to turn off and back on
If your Roku TV has no Power option, go to Settings
Select System
Select System restart
Select Restart
Press and hold the Power button and Back button on the remote for a few seconds if your remote supports it
If the TV is frozen, remove the batteries from the remote, unplug the TV for 30 seconds, then plug it back in