Hello,
Thanks for joining HP Support Forums. I’d glad to be of your assistance!
Going through the post, I understand that the laptop is not booting. First off, can you get the startup screen? Restart the PC & immediately tap on the "Esc" key to get the startup window. Let me know if you can log in to the startup screen.
Alternatively, check the steps listed here: http://hp.care/2s3dZZI
Please let me know if this resolves the issue, or if you require further assistance.
Cheers
Please click "Accepted as Solution" on the post that solves your issue to help others find the solution. To show appreciation for my help, please click the "Thumbs Up Icon" below!