OK, Solved at least part of the problem. My VDI is good. Tuner works. Model light comes on, so I figured finally that the cable is good. Checked and double checked the inputs and outputs and changed them(even though I strongly felt the were right) Nothing. WTF! Accidently hit one of the pods foot switches and suddenly had sound. What? I play with the pod in pedal board mode, and use an external effects pedal( a Fultone GT-500) so I have the effects loop as a foot switch.
Discovered that if no cables are connected to the send and return if that switch is on everything cuts off. Seems wierd to me.
Anyway, solved my problem from yesterday of no sound. Still don't know why I had a loud, very loud buzz on Friday night at set up for the gig. I can only guess it was the outlet I was plugged into at the club. But the bass player was plugged into the same one and had no buzz. I have no buzz here at home. Will play at gig level later to see if it returns. I might have to experiment with different grounding options.
Anyway, a lot of you probably already knew about the effects loop thing and it would have helped if I would have thought to mention it was in the effects chain, but didn't know it made a difference. So, I get an ah ha moment.