so what is the whole story, all you said was boot.
what do you mean by boot.
the BIOS is what boots, when you turn on any PC
then it loads a OS from there.
my guess is the HDD-0 is missing in BIOS
if yes the HDD is dead.
the probooks have a hdd test in BIOS run that if wise first.
i bet it can even find it to run.
and is dead. dead HDD.
G5 means generation 5,
this G5 is one of my all time favorite laptops . zbook even better.
read page 95 in your service manual at HP or here.
https://www.manualslib.com/manual/1305918/Hp-Probook-440-G5.html#product-ProBook%20450%20G5
if the HDD test fails, then it is bad, if also silent it is bad fully.
if it is bad, you buy new SSD, and install w10
end story./
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