I have a D80 and an SB600. The last couple of days the SB600 has not been firing properly, even with brand new batteries. I have hit the reset buttons numerous times. Sometimes it won't fire at all, sometimes it fires real weak like the equivalent of the flash that fires a slave. Sometimes it fires fine. I can get it to fire more often at full strength if I hit the +/- buttons to take it away and back to 0.0. The camera icon shows on the flash so the flash thinks it's connected to the camera. Any kind of troubleshooting recommendations? Thanks OTAP!