If your PC is not booting and showing an "Inaccessible Boot Device" error, then here is a fix to resolve this issue and make your PC function normally. The inaccessible boot device is a common ...

HP PC Hardware Diagnostics UEFI helps you diagnose and fix PC memory, disk, etc, problems on Startup. Learn how to use it, install it or disable it.

Looks like HP just released "HP Software Component 4.1.4.3079” to fix the conflict with Windows Defender that's throwing BSoD "KMODE_EXCEPTION_NOT_HANDLED”.

While starting your computer, if you get a DISK BOOT FAILURE – INSERT SYSTEM DISK AND PRESS ENTER error, this article would be handy for you.