Well, just wondered if anyone had the same problem I do with thier Nikon SB-900 flash. I bump it the other day and now it comes on but won't flash. It does light up and I try to TEST FIRE it and it doesn't do anything. I wonder if I blew the bulb? No one here in my city works on them , so it would have to sent in to Nikon Repair. I have sent my stuff to Merriville NY , but with the weather I called and they are on backup elerrric right now and haven't answered my e-mail. Would like to talk with them before I send it or and something back from you guys. Let me know what you guys think. I always listen on hear. I have had the Nikon SB 900- over 4 yrs now too . Love it. Thank guys for listening and look forward to your reply.