I have an HP All-In-One with no OS installed that won't boot from bootable usb

[Phaidras1]

I have an HP All-In-One that has no operating system installed. I have tried booting to a bootable usb drive to reinstall windows 11 home, but it will not detect it. Also tried using a bootable installation disc and repair disc. The farthest I get that way is it tells me "press any key to boot from cd", but when I do it goes straight to a blue pop-up that sais "boot device not found" and tells me to install one. It sais  "hard disc (3F0)" and"F2- system diagnostics, (which tells me everything is fine and restarts). How the heck can I install an OS back on here? It got this way when I tried puting a fresh version of windows 11 home on it 'cause somehow the system got ALL messed up during a system refresh, (where it reinstalls the OS with the option to keep or not keep ur files). I put the bootable usb in, it asked me which partition to use, it had two large ones and three small empty ones. I deleted the second largest one, THEN it tells me can't install on the primary because it's protected by bitlocker, (wwhich I have never used and don't have the key for). That's where I am now. Help?!?! 

[Hawks_Eye]

Hi @Phaidras1 

Welcome to the HP Support Community! We're here to help you get back up and running.

I acknowledge the situation. The “Boot Device Not Found – Hard Disk Error (3F0)” message indicates that the system is not detecting a valid bootable device. Since you are attempting to reinstall Windows 11 Home, let us proceed step by step with recommended methods.

Confirm BIOS Boot Order

• Power on the computer and immediately press F10 to enter BIOS Setup.
• Under System Configuration > Boot Options, ensure that USB Hard Drive or CD/DVD Drive is listed first in the boot order.
• Save changes and exit.

Run HP PC Hardware Diagnostics

• Power on and press F2 to open HP PC Hardware Diagnostics (UEFI).
• Run the Extensive Test on the hard drive to confirm hardware health.
• If the test passes, proceed with OS installation.

Prepare HP Recovery Media

• Use another Windows PC to download and install the HP Cloud Recovery Tool.
• Insert a USB drive (minimum 32 GB) and create official HP recovery media for your All‑in‑One model.
• Insert this USB into your All‑in‑One, power on, and press F9 to select the USB device from the Boot Menu.

Clear BitLocker Protection

• If the installer reports BitLocker protection, open BIOS Setup (F10).
• Under Security > Secure Boot Configuration, restore factory keys and ensure Secure Boot is enabled.
• Delete existing partitions during installation and allow Windows Setup to create new ones automatically.

Install Windows 11 Home

• Boot from the HP Cloud Recovery USB.
• Follow on‑screen instructions to reinstall Windows 11 Home.
• Allow the tool to partition and format the drive as required.

Reference:
HP official support article for “Boot Device Not Found – Hard Disk Error (3F0)” provides detailed guidance:
HP PCs - Hard disk 3F0 boot device not found error | HP® Support

This process ensures the system recognizes the bootable media and reinstalls Windows correctly. 

Take care, and have an amazing day!

Regards, 

Hawks_Eye