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As I understand the computer is powering on, however, doesn't have a display on the screen anymore, Don't worry as I have a few steps to help you get through this concern,
To provide you with an accurate solution, I'll need a few more details:
What is the product number of this computer? (Ensure you do not share any of your personal information such as serial, phone number, email ID, etc...) http://hp.care/2bygf7l
What is the Operating System installed on the PC?
Have you made any recent changes on the PC before the issue started?
Was there any update/reset interrupted recently?
When was the last time it worked (date)?
Please attempt the below steps:
Let's start off by performing a Hard reset on the notebook: A power reset (or hard restart) clears all information from the computer's memory without erasing any personal data. Performing a power reset might fix conditions such as Windows not responding, a blank display, software freezing, the keyboard stops responding, or other external devices locking up.