Pressing a combination of buttons on the keypad of the supplied remote control will reboot the Internet TV device. See below for the button combinations on your remote control.
For the NSG-MR1 remote control:
Simultaneously press and release the CTL+ALT+BACKSPACE/DELETE buttons.
For the NSG-MR5U remote control:
Simultaneously press and release the CTL+SHIFT+BACKSPACE/DELETE buttons.
NOTE: The screen flashes and the Internet TV device restarts.