No offense to your user/customer but those mini pcs using laptop style power supplies are terrible. Just because you game pushes their (inadequate) hardware to the limit, does not make you liable.
That is very poor design on behalf of HP by not having some sort of limiter on the hardware or an inadequate 65w power supply running a desktop pc. Yes the TDP of that intel is 35W but when pushed it can exceed that unless its throttled and along with usb devices the rest of the hardware attached memory etc etc its gonna push that 65w.
I do laugh when i see desktops using laptop style power adapters. frankly its absurd.