Hi
Try checking the following things...
-Does the marker even turn on? If not, then replace the battery. If yes, what light sequence does the LED go through when it turns on?
-Is your air-system correctly attached? Do you have a full tank of air, and have you adjusted the output pressure of the Hyper3 reg (the fore-grip) of the SLG?
-With the marker turned on (eyes turned off), and aired up, when you pull the trigger does the solenoid make a loud clicking noise, or a no noise at all?
Let me know how you get on with these and I can make a better assessment of the problem. If you wish you can contact me directly;
eurotech@dyeprecision.com or by phone - 02086496330
Thanks
Ash Chaplen
DYE Europe