Resolve Windows 10 related issues for your HP computers or printers by HP Windows 10 Support Center
When I press esc, then f9 on startup, usb and DVD don't appear on boot manager
Newer laptops using UEFI instead of BIOS have settings that prevent booting from anything other than the built-in hard drive -- and both of these have to be disabled:
1) Secure Boot
2) Disable booting from portable devices
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