Check the power source first. The On/Off switch is in the OFF (O) position. Set it to the ON (|) position.
If it's on, the power cord is not plugged in. Plug it into a 120V outlet. The outlet must supply adequate power. If not, try a different outlet. A tripped pressure washer circuit breaker will also prevent startup. Let the unit cool, then restart.
If the power switch is ON but the motor still won't start, check the gun trigger. With the power switch ON, push in on the gun trigger. This engages the AUTO ON switch. No trigger squeeze, no start.
Never use a damaged cord. Replace it immediately. Keep all connections dry and off the ground.