I have an older Nikon SB-24 Flash which seems to do everything but flash. The back LCD shows all info, all the knobs and buttons work but it won't test flash and I dont hear the recycle-up sound anymore.:thumbdown: A few days ago when I started it up I heard a pop, almost like a discharge, but no light/flash. Is this junk or should I get it fixed? Is it the main capacitor? Ideas?