The unit is in standby mode. Press the power button to wake the display.
If that didn't work: Check the power outlet. This unit uses 1690 watts and must be plugged into an outlet on a dedicated 15-amp circuit breaker. If it's on a 10-amp breaker or sharing an outlet with another appliance, it may not power on. Plug it directly into a wall outlet on a 15-amp circuit with nothing else plugged in.
Heads up: If the screen shows an "E" message, the unit has a fault. Unplug it, wait 15 minutes, then plug it back in. If the "E" persists, contact Ninja Customer Service at 1-877-646-5288.