quick question for Brian

This is the owner of the blue dm4 that i had you work on and I dont know how much luck im going to have trying to reach you on here but i tried shooting it again when i got to my house and i have to be doing something wrong...I turn the gun on and then the eyes and it blinks blue then red like it should and i pull the trigger and nothing...no sound at all. I have no idea what it could be since i am fairly new to paintball so any information from anyone would be greatly appreciated thank you.