[SOLVED] PBP will no longer power on

[s3rvant]

After receiving my PBP and tinkering with Manjaro (including fully updating the system) I decided I'd rather try out a more familiar distro so flashed @mrjay 's Ubuntu image; details here:
https://forum.pine64.org/showthread.php?...0#pid68220

The battery was showing 20% when flashing completed however once the system powered down it will no longer power up. The power button does not appear to have any effect at all.

I've tried searching the forums here for similar issues and so far have tried:

• Booting with / without A/C adapter plugged in
  
• Booting with / without SD card inserted
  
• Verified that A/C adapter is charging (light comes on, charges then turns off)
  
• Verified the A/C adapters are working by charging a 2nd PBP that is still working
  
• Removed the battery, connected the power bypass cable and attempted to power on with A/C adapter
  
• Reseated the eMMC
  
• Booting with / without eMMC hardware switch toggled
  

Nothing appears to have had any effect and I'm not sure what else I can do; any advice would be much appreciated