Saturday night, I prepared my camera and flash for the Hearing event yesterday. I mad sure all batteries were fresh, cards formated, camera settings what I wanted them to be. When I got to the Sheraton and put my flash on the camera, it wouldn't flash! My settings were right, but it was as if I didn't have the flash mounted to the camera. I tried this with both my SB800's. I finally had to go to my 18-200 vr lens and use the onboard popup flash. Dunno if it's worth it to send off to Nikon or what to do.