Hello unclesue,
Welcome to the HP Forums!
I understand the computer will not start and a blank screen displays. Then issue is hardware related, but I will do my best to assist you. The best troubleshooting for this issue is located in this HP document: Troubleshooting Black Screen Displays with No Error Messages During Startup or Boot
The document can help by providing information on how to reset the notebook, and how to identify the root cause of the issue. I encourage you to look at this document. If you cannot resolve the issue, 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. Thank you for choosing the HP Forums.
Have a wonderful day! 
Mario