Check the negative contacts on your flash’s AA battery magazine. The metal springs located at the bottom of the battery magazine should be angled up at approximately 30˚ to maintain contact with the battery. If one or more of these contacts have flattened then the flash will not power on.
Fortunately, there is a quick and easy solution. You can restore the angle of the metal spring to its original position by placing the tip of a small screw driver under the end of the metal spring and gently lifting up. Be careful not to lift the metal spring beyond 45˚.
If you are uncomfortable doing this yourself then please contact us directly to inquire about a repair. Additional battery magazines are also available for purchase here.