To restart the machine you will need the keyboard located inside the pay-station.
Hit Ctrl+Alt+delete, this will pull up Switch users, in the bottom right corner of the screen there is a power button, hit the arrow on the right side of that and your 2 power options will appear.
Select restart and the machine will begin to shut down
Note: if you choose Shut down, you will have to manually power up the PC by hitting the power button on the back side of the PC
If a reboot does not fix the issue, please contact Avanti Support - (844) 695-4675.