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Have you tried using the wireless mode? Even if there is a problem with the hot shoe interface, it might still work using the wireless mode. To do this you have to set both the camera and the flash. On the D70, under the menu with the icon that looks like a pencil, select Flash Mode|Commander Mode|TTL|OK. On the flash, hold down the Zoom and [-] buttons to get the CSM menu. When you see the zigzag arrow, push the Mode button to turn on the wireless mode.You may have to use the [+] or [-] buttons to cycle through the menu to find the zigzag arrow.
Now you should be able to use the flash detached from the camera. Just pop up the D70 flash, which will tell the SB-600 what to do via light pulses. There are other settings that may be required (channel and group settings must match between camera and flash) and be careful not to block the light sensor on the side of the SB-600. If the wireless system is still working, you may find you like it better than hot shoe operation.
The Quantaray Digital NK Module has a small tab on the side of the raised boss that the 8 pins sit on that prevents it from mounting on the QTB-9500A. It's intentional- the NK Digital Module is made for newer Quantaray flashes only. You'll need the older-style AF NK Module to attach to the QTB-9500A.
Check if something is preventing the flash to pop up 'fully'. Check for some dust or other particles trapped between the flash and the body. Does the screen say 'Subject is too dark'? If so, the flash has not popped up fully.
If you shoot in Auto mode, the camera will not allow you to turn off the flash when it senses that it is needed.
To use the camer without the flash, change the mode to Program ("P"). Once it's in P mode, the flash will not fire as long as it's in the down position. When you want to use the flash, press the speedlight release button (the one with the little lightning bolt near the mode select dial).
I had this problem a while back, but was fortunate to get it fixed under warantee as it was less than six months after Nikon repaired my D70 for the "blinking green light of death" fault.
I'm afraid this is a repair job for Nikon or an autorized workshop. It is most likley the flash tube. If you fancy taking your camera apart (I warn you it would be a fairly difficult job) then please be aware that you may get a significant electric shock from the flash capacitor, which will remain charged.
Well, you are not going to like my answer. The troubleshooting guide for the D70 says it could be 1 of several PCBs (printed circuit board) being faulty or the connecting FPCs (flexible printed circuit).
You'll need to locate a local repair person or use the reapir service search here on Fixya. Nikon USA repairs will be $$$$
Unfortunately, you may have a faulty flash pcb (printed circuit board) The part is around 50$ plus installation 200+ total repair cost. A work around would be to use an external flash unit from the hot shoe
According to my information, the camera may need a new flash PCB (printed circuit board). Check the repair service search on this site for someone in your area. The part number for the circuit board is: 1S014-020-1 and runs about 50$