Have you tried a different power brick?  Also try pressing the power button for 10 seconds.  

Thanks your quick response - yes tried three power sources and three cables - and pressed the power button for 15 seconds. 
It’s been working perfectly up until yesterday - it’s just stopped!!

It’s about three years old - is that about the life of one of these units?

She Who Must Be Obeyed has been pressing buttons - and she got the orange light flashing - and it is now working on Bluetooth with Boom Radio from my iPhone - YAY - but now there is no orange light even when plugged in …

Any ideas?  Still a dead battery problem?

Now, if I plug it into my iPad Mini 3.0 amp supply, the orange light comes on - and after about 3 or 4 seconds fades and goes off.  But still playing Boom Radio here in Tenerife on Bluetooth …
More ideas?