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Get some fresh batteries is a sure first move.
How about the RFM idea as second move?
it lights up red
You should see a symbol in the viewfinder when the flash is fully charged, don't own a Nikon, but I'd guess it's a lightning bolt symbol?No mate no camera flashing at all on the screen, but its shows my aperture on the screen.
Do i need to change any of my camera settings? Nikon d3300
You should see a symbol in the viewfinder when the flash is fully charged, don't own a Nikon, but I'd guess it's a lightning bolt symbol?
IIRC some lower range Nikon cameras don't allow high speed sync, so to test the flash, once you've succeeded with the flash test button.
Try the camera in full manual, set 100 ISO, 1/125 SS and f8.
See if the flash fires with the shutter