@KMax68 , welcome to the Community.
I believe this is your monitor: https://partsurfer.hp.com/Search.aspx?searchText=C4D30AA
If so, you can find the part # for the adapter. HP no longer provides this product. So, you will have to run a search to find a seller for it. Please read the "Important Notice" to assure that you order the correct part.
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!!