Black Screen, only power works

Hi guys, my notebook (HP G62 b19sl) doesn't work anymore. I explain better the problem right now.
When I press Power Button the screen remains black and only the fans runs. Only Power LED and Wi-Fi LED are ON.
I can't do anything if I press buttons. CAPS LOCK's LED it's not ON.
I brought it to a Computer Expert. Maybe he resets BIOS and Notebook was operative but when i pulled down the screen to interrupt my work, computer showed black screen again when i pulled up the screen to continue my work.
The combination "Windows+B" without battery, doesn't work to reset BIOS.
I hope someone could help me.
Thank you

Hello hamoon,
Welcome to the HP Forums! I hope you enjoy your experience!
I understand your computer will not start properly. I will do my best to assist you with this issue! To troubleshoot, please try the steps in this HP document: Computer Does not Start
This document contains steps such as resetting the notebook and more, corresponding to the exact symptoms. I believe this document will resolve the issue. If not, 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. Thanks for bringing this issue to the HP Forums. Have a great day!
Mario
I worked on behalf of HP.

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