My D3100 9s brand new and the flash is not firing at all. The first five or six shots I took the flash worked and now I cannot remember if I changed an obscure setting. I have tried resetting to default. I read a similar thread with this issue here that was not resolved so I am asking again in the hope I do not have to replace my new D3100. I've compared settings with my Dads D5200 and the only difference is that that his flash fires and mine does not. ;)
I'm a little flustered with this, and any help would be great.