that rx 400 card on your ho to me looks unlikely for what I see just a card that requires ''''READ PAGE 2-3, Under SFF models ---
that sets your limitations (Low Profile, Maximum 25 watts in PCIe Graphics x16 slot).'' ?
that's between you and HP and anything you do over what they speced and sold the computer for is ''ALL YOUR OWN RISK''
youi risk and buy the card and it works , well no harm . you buy the card and it done for any reason , well you out the money on the card if you cant return it for a refund
that's all there is to it .. so with whats said there it seems to be a 25w slot on that motherboard and then you put a card in that needs 75w ?? do you expect it to work ?
all you can do now is what...