Made a fresh start up using Noobs 3.9. I press 3 at start up HDMI goes blank but no composite video. I have actually had a RaspberryPi B. I had a few problems with composite video but eventually sorted it out. The reason I bought a new Pi is that I shorted the first one. I thought a replacement Pi B...

It works with HDMI.

When I connect power red and green flash then finishes on steady red. Yes, checked cable with multimeter and is the same as from the posts I have seen. It is one used for Ipod av.

Have no composite video output from AV jack. I am using correct A/V cable as suggested on multiple posts. Edited config.txt, as suggest in posts. No life to composite video even pressing 3 on NOOBS boot. Please help. Bought new cable especially to get this working.