[PROBLEM] Blank screen post one time successful boot on pi3

[Dave400]

Software
XBian version: Updated via apt-get update && apt-get upgrade 1st June
XBMC/Kodi version: 16.1 (assumption, it's running the newest skin when I briefly ran it last night on the pi2, cannot boot to find the exact details)
Overclock settings: Default

Hardware
Device type and model: Pi2 and Pi3
Power supply rating: 5v 2A for Pi2, 5.1v & 2.5A for pi3
SD card size and make/type: 64GB Kingston UHS Class 1
Network (Ethernet or wireless): Ethernet
Connected devices (TV, USB, network storage, ...): TV, Media held on network share

Log files
Link to logfile(s): Cannot boot to grab them

Problem description:
Having updated last night to the current build today I switched the memory card over to my pi3, plugged it in briefly, it booted, and once Kodi was open, selected shutdown. Power off then setup on TV. steady red led with occasional green led flash (once every 20 secs or thereabouts). Placed it back in the pi2 and the same. At this point, USB inactive and Ethernet act/link unlit.
I have a Retropie on an identical microsd card, placed that in the pi3 and pi2 and it boots ok..