I have the same problem with an HP ENVY x360 - 15-cn1022nb.
It appears a few days after changing the battery, the computer did not see the new battery (not a genuine hp). So I left it without battery and after a week it did not boot anymore, I see the HP logo and a few seconds later it turns off and I can hear the click of the disk losing power.
I am afraid it could be a MB problem.
Luc