PowerCore ii 10000 no lights and not charging

Hi there I bought the PowerCore ii 10000 about a month ago I charged it fully (all lights were blue) then tested it on my iPad to check that it worked and all was good. I have just tried it again and it’s not charging any of my devices. If I press the power (?!) button none of the lights come on and if I plug the PowerCore in to an adapter it doesn’t seem to charge up. I have left it about and hour so far and no lights are showing yet.
Any suggestions would be gratefully received

For a reset connect the in- and the output with the added cable for 10 seconds.
If you charge it after that procedure : DO NOT press ANY buttons.
If all these doesn’t help, you should contact