I searched thru the forums and didn't find anything about the problem I am experiencing with my relatively new SB-600. It won't turn on, unless I reset it, and then it will only stay on until a reposition the flash head. It's not a battery issue, I've cycled thru many batteries fresh out of their packages to determine this easily enough. No damage has occurred to the flash either. The screen will sometimes flash green at me when I'm repositioning the head while it's off, but that is all it will do unless I reset it. Any guesses? Thanks for your help!