@haifaaa5, Welcome to the HP Support Community! I’m here to help.
I understand you are not able to use the computer due to a black screen. Let us try these steps:
Power reset the computer as shown in this document.
Follow the steps mentioned in this document - Troubleshooting Black Screen Displays with No Error Messages During Startup or Boot
Hope this helps! Let me know how it goes.
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Have a great day!
KUMAR0307
I am an HP Employee