Chad,
It worked!!

Oh thank you, so much!!!

What a state of panic I was in!
Couple of questions, I had been using an 801 cartomizer with an adapter; would this have been the culprit or could it have happened using a 510 cartomizer as well and should I just stick to 510 connections or can you (anyone) recommend a good/reliable adapter?
Thank you, thank you, thank you!
Juanita
Same thing happened to me with a 510/808 adapter. The center post of the adapter protruded out too far and pushed the center pole down. The next time I tried to use a regular 510 carto, it wouldn't fire and I had to lift the post back up.
I'm not sure if your adapter is built the same, but the solution for me was to give the center post of the adapter (on the 510 side) a turn or two with a small screwdriver to make it more flush with the adapter body. Now, it doesn't depress the center pole of the PV's 510 connection every time I attach it.
Don't bother getting another adapter. There's not that much difference from one to another. If you post gets pushed in, just pull it back out. It's not hurting anything and once you get the hang of it, it takes about 3 seconds. Take the battery out or make darn sure you don't hit the button while your doing it though. I use a stiff plastic stick instead of a screwdriver. A piece of bamboo skewer works good too.
Having said that, it is possible that a 510 carto could have done it as well. They aren't all exactly the same and, now and then, you'll get one with a "too-long" center post. Nothing to worry about. Just pull the post back up on your SB and vape on.