So how far back are we likely to go……………..

[Lightspeed]

Simple answer Dev, is that I do not know how far back civilization could slide.

Does anyone?

Yes we have accumulated knowledge that will be usable to get things restarted.

Computer based data banks are vulnerable both to software virus attack and are of course totally dependent on electrical power.

John and BP's take on things are a bit too extreme for me, but I respect their views and learn from them. Maybe I'm in denial, but I hope things will not slide that far. But these guys might be right. I appreciate them sharing their knowledge and thoughts.

So back to your question, I believe that its very possible that the lights could go out, but I do not know for how long. My expectation is that an electrical grid system of some type will get revived. If it doesn't its still the same mantra here: " adapt and survive"