Bests & Worsts Reviews from Amazon

This unit has a proprietary 180 watt power supply. You can only purchase from hp. I have been on the phone, email and chat now for 6 hours to purchase the 400 watt power supply so I can upgrade the graphics card. Now I am advised that I can only email hpparts.sales.ams@hp.com and hope for a reply. I failed to read the return policy on this prior to purchase. That is my fault. **** Update: I am been in the loop with HP for 5 days now trying to find out the information to purchase the Platinum 400W power supply and GTX 1650 Ge Force graphics card. No go! I have been transferred to management at every level for an apology with no resolution. This is my first and last computer purchase from Amazon and my last period for HP.