I actually have many questions, but will focus on 1 at a time.
I got my Raspberry Pi 3 B today as well as an A/V cable.
This is the cable I bought:
Is this supposed to work with the 3 B?
There are other cables from China, which have a little extra adapter, and are shorter... but those do say 3 B in their description.
It was my understanding from what I have read that the Raspberry Pi should output automatically when using this cable and no HDMI cable is connected, but I just get a black screen (with a short reaction on the TV that looks like it's about to show something when the RPi 3 B starts, but stays black)