Avtex DC cable Check it hasn't come loose.
I recently posted how great the support was at Avtex - as my 12v cable ceased to work - and they promised to send me a new one under warranty. Parcel arrived and contained a Remote Control! So I called them back and very helpful man asked if I had checked the fuse in the DC cable. Which I hadn't as I didn't know anything about them. On checking I found that the end had come loose and there was actually no contact left to make the connection.
What I am saying is check that the end of your 12v cable is still screwed in tight - or you may end up with no contact. I now have the new cable - and sent them back the old one which is clearly lacking some spring bit. (and sent back the remote!)
I still rate Avtex support as very helpful although I can't quite understand how I was sent a remote and not a cable - but from my call on Monday - I am sorted by Friday1