Last week I purchased the Yongnuo 560 IV from amazon at a good rate, and this week I finally had an opportunity to play with it. I immediately loaded the flash with 4 double AA alkaline batteries like the company suggests, and when I turned it on the pilot light stays green lit. In fact, only on occasion does it turn red and become ready to fire, and only even more on occasion does it fire repeatedly when I shoot. This is my first flash and I didn't go for the wireless trigger or anything special because I wanted to focus on my flash basics. The flash when utilized is camera mounted, and it just doesn't seem to want to do anything once attached. I searched online for troubleshooting guides, and I didn't come across anything very helpful. Tutorials for the flash are more like exciting reviews (which is why I opted for the flash in the first place), so nothing helpful.
Thanks for the advice,