@SeanRPR , welcome to the Community.
The motherboard in your computer is HP proprietary. It has a 4-pin power connector instead of a standard 24-pin ATX power connector. You will have to buy any PSU upgrade from HP. HP has a 400W PSU (L69242-800) that is compatible with your motherboard. You can order it on HP PartSurfer by clicking the box next to "Add to Cart".
Here is a Power Supply Cross Reference Chart that will show you where I got this information. Your exact model is not in the Chart, but there is a Baker motherboard in the TE01 series.
You can contact HP Customer Support to see if the 500W PSU (L5757-800) is compatible before ordering the one with 400W.
Please click the Thumbs up + button if I have helped you and click Accept as Solution if your problem is solved.


I am not an HP Employee!!
Intelligence is God given. Wisdom is the sum of our mistakes!!