you should get a reaction with minimal air , also note the battery . Once Ego's get to half battery life , they can be very erratic.
Take the bottle off, make sure you have an empty gun. Turn it on, turn the eyes off, then press the trigger multiple times, you should here the solenoid clicking , also note you should see your display change registering your trigger pulls. If you see none of the above happening, then you have a problem with your trigger.