I don't use my flash that much, but I tried to use it today and it is doing some funky stuff. I pop up the on board flash, the icon starts to flash in the view screen, I press the shutter release and nothing. Camera is set to manual mode, SS of 1/50 and it is set up TTL. I have tried several different modes, P, A, and nothing. I tried to set up my SB-600 wireless (D70 in comander mode and flash in wireless channel 3 group A), and nothing. The only way I can get any kind of flash is to mount the SB-600 in the shoe. Any thoughs??