Suggest soft reset....➕ And center button....
If you are sure it is getting usb power....ie charging lights are cycling....but still will not turn on you could try
Disconnecting power to hard reset it as such
See here
......
Fixed.
I our speaker had several buttons pressed at once and it 'crashed'
Would show charge lights but not charge, charge continuously never stop....overnight....(I knew it had 50% charge in battery)
Would not turn on...dead...100%
Solution...disconnect internal batt from motherboard for a few secs...complete power down.....now all ok...