As the unit is within the warranty period, I would contact HP. 1 (800) 474-6836
It could be either the power supply, or the power board (inside item).
1) Service hours have changed.
2) You have to wait 45+ sec for an operator
Here is a link to a new PSU if you want to try it.
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HP Envy 8 5010 Tablet (2) HP DV7t i7 3160QM 2.3Ghz 8GB Printer -- HP OfficeJet Pro 8620 Legal Custom Asus Z97D, I7-4790k, 16GB RAM, WIN10 Pro 64bit, ZOTAC GTX1080 AMP Extreme 3 fan 8GB RAM, 500GB SSD, Asus PB287 4k monitor, Rosewill Blackhawk case and 750W OCZ PSU.