BIOS not booting. Can't access. Old HDD is accessible, but my new HDD won't boot with another OP

[VincentRB]

I tried dual booting. Old HDD had Windows 8.1 Originally, but I brought it to a local pc fixer, because my pc couldn't handle the Windows 10 upgrade. They downgrade it to Windows 8.1 Pro instead of Single Language.

Long story short. I bought a new hard drive. I installed windows 8.1 single language on the new hard drive, but i had to disable secure boot option and enable the legacy boot option. I was able to boot up for my usb installer and I was able to install windows 8.1 to the new hard drive. 

The problem is I disabled legacy boot and enabled secure boot again. I turned on my pc then the hp logo does not show up anymore and there is no loading screen but a few seconds later my old hard drive with windows 8.1 pro boots up and I can see my new hard drive with the windows 8.1 single language. I decided to remove the old hard drive and keep the new hard drive instead. The pc then didn't boot up at all. I just have a black screen. There is no option to go to the bios and I can't see the loading screen.

No error messages. No error code.

[Echo_Lake]

@VincentRB

Thank you for posting on the HP Support Community.

I appreciate your efforts to try and resolve the issue. I would suggest performing system factory reset will put the computer back to the original factory settings in this way all corrupted and outdated software will be removed. 

While doing the recovery there is an option to backup your personal files. If you have not previously done one now is a good time. 

Restoring Files that were Backed Up Using HP Recovery Manager (Windows )You can also contact HP support for assistance. They can remotely access your system to help alleviate difficulties: www.hp.com/contacthp/

The HP Cloud Recovery Tool allows you to download recovery software to a USB drive. You can use the downloaded recovery image file in order to install the Windows operating system. 

• Click here: https://support.hp.com/in-en/document/c04758961#AbT3to perform System Recovery (Windows 10) 
• Click here: https://support.hp.com/in-en/document/c06162205 to Use the HP Cloud Recovery Tool (Windows 10)

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.