Hello cristiaan4,
Welcome to the HP Forums! I hope you enjoy your stay.
I understand your computer's display is blank, and there are flashing LED lights. I will do my best to assist you, and I apologize for the delay.
To troubleshoot the issue, I encourage you to please try the steps in this HP document: Troubleshooting Black Screen Displays with No Error Messages During Startup or Boot
This document will assist you in idenfying the source of the issue, and can suggest numerous fixes. I believe the issue can be resolved by trying these steps. If not, the computer does have a hardware issue. To address it, please contact HP phone support. You can utilize this website to learn how to contact HP appropriately, based on your region: Contact HP Worldwide
I hope this information helps you. Please let me know your results. Thanks for posting on the HP Forums. Have a great day!
Mario
