Laser Not Visible

We have blinking voltage (about 5v) across the laser pointer pins with a corresponding blinking light on the MOSFET, but no visible laser beam. Is there anything else we can check? Should there be more voltage? THX ahead.

check that you have the right pins plugged in I would also check that it is getting a signal from pin a4. if that does not work then it might be burned out and you will need a new one