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If it only shows 'Welcome to VA 70', then it has failed to initialize and has locked up. This sort of problem can be quite serious. But try unplugging the device from the power, and leaving it that way overnight. That might, possibly, clear up the problem if it was just a temporary 'glitch'.
First, if you would like to try an easier possible way, try holding down the Power button for at least 30 seconds, and see if it shuts off that way, making the need to unplug it somewhat less urgently troublesome.
(It's fair to warn you that unplugging it from the power may activate its anti-theft mechanism, and cause it to require a code if/when it starts up OK again.)