Try putting a new battery in. Usually fixes most problems with ions.
Chech the wire connecting the eyes to the board is correctly plugged in at both ends (into the eyes and into the board).
Check to see if the eyes have been bent on their board.
Have you been dry firing the gun alot or used it alot? If your ball detents are worn (usually through dry firing) the balls maybe rolling forward just enlough to no longer be breaking the eye beam.
Turn the gun on (without any air) and check the on/off button is single flashing (means eyes are on). Put youe fingure down the feed neck into the breech, making sure it breaks the eye beam. Does the light start flashing constantly or remain single flashes?
Afew ideas to get you started.