Hello adrewry :smileyhappy:
Welcome to the HP Forums! I hope you enjoy your experience!
I understand your computer will not start, indicated by immediate shut down. I will do my best to assist you with this issue, although there is a hardware issue! To troubleshoot, please try the steps in this HP document: Computer Does not Start
This document contains steps such as resetting the notebook and more, corresponding to the exact symptoms. I believe this document will resolve the issue. If not, I would contact HP phone support for hardware assistance.
You can utilize this website to learn how to contact HP appropriately, based on your region: Contact HP Worldwide
Please let me know if you have any other questions or concerns. Thanks for bringing this issue to the HP Forums. Have a great day! :smileyhappy:
Mario