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On computers the F key varies to boot to the external USB hard drive.
List of PC brands with their corresponding hot-keys
For the HP notebook that I am using now the F9 key is used for the boot menu.
Typically the F10 key boots to the BIOS.
The F2 typically boots to the HP UEFI diagnostics.
Power on the computer and repetitively click the applicable F key to boot to the bios boot menu and select the external USB hard drive.
Clean Install Windows 10