Greetings @Franck_Bush,
Welcome to HP Forums and Thanks for the post.
I understand that you are unable to install an operating system on your computer.
Not to worry, I will be glad to help.
Is the HDD listed in BIOS?
May I know which operating system are you trying to install on your computer?
Please provide the product/model number of your computer. Click here. (Please do not share the serial number of your computer.)
For you to be able to install any operating system on your computer, the HDD needs to be detected.
Request you boot the computer to BIOS and check if the HDD is detected or not.
Please provide the requested information for further assistance.
Keep me posted.
Chimney_83
I am an HP Employee