ok. um on the from of your gun there is a little siver knob on the front of the gun. make sure it is vertical if is not then that means your air is turned off. if you check that and it is vertical and nothing ealse is working. try changing your battery. and if that dont work then your best bet would be to bring it into mvp sometime saturday and have brain take a look at it again. im guessing it probley a simple fix but its been awhile since ive played around with a dm4 and cant think of everything off the top of my head with out looking at it. but try that and it that dont work bring it in.