Good news. I got my hands on a DC-3g power supply from a HD500X and the POD HD appears to be working fine as well as the FBV Express MKII floor board. The power supply for my old Pod 2.0 is toast though along with the AC power supply that came with the POD HD. Apparently plugging an AC power supply into the DC powered PodHD cooked both AC power packs but not the POD HD. I guess thats much better than the opposite happening.
Just a note for your info - I swear to you that the barrels are exactly the same size, inside and out on both the DC-3g power supply and the Line 6 AC power supply that somehow came with my POD HD. They both fit the jack perfectly without any damage or forcing etc. This might sound like an impossibility to you given your experience but I assure you, they are the same.
Its been a roller coaster day. This morning everything was working wonderfully and I was ecstatic. This afternoon, all hell broke loose and I figured everything was pretty much melted. And tonight it appears I'm only down an AC power supply for my old pod 2.0. I found a lower amperage AC power supply from a looper pedal I have and tried it on my POD 2.0 It powered on just fine so it appears to be working as well. I didn't leave it plugged in long as I want to get the right power supply for it.
Having said that, I'd really like to know how an AC power supply came with the DC powered POD HD that I bought new from a local music store / Line 6 rep.
I probably won't find out until after Christmas.
Thanks a ton for your help on this!