catfish252 wrote:
Neither flash will power up on or off camera now or only when connected with the SC-29 cable, if it's only when the cable is attached try commander mode with the D800 and see what happens. If the D800 is experiencing weird problems then I would imagine the power supply or main board in the camera may be suspect. Worth a call to Nikon come Monday. (1-800-645-6687) 9AM-8PM EST, Monday through Friday.
If NEITHER flash will power up on or OFF the camera, the problem is with the flash units! I have an 800 I use with Nikon's Speedlight system and have not experienced any problems.
Off the cuff I'd say battery problems or capacitor problems. Hard to believe you'd have capacitor problems in two devices though!