My HP Z420 (and my Z400 before that) will sometimes not shutdown completely without pressing the power button and holding it in. If I just go to Shutdown, it will close most things, then shut off the monitors, but still be powered up (light is on in front, and can still hear fan running). I've waited a long time, even overnight, but I still sometimes have to manually power it down to shut it off completely. I can see by a quick search this is a common problem, but I haven't seen a definitive solution. One solution talks about a Intel Virtualization Tehnology, but I don't have that in my Device Manager where they say it's located. thanks for any help you can give.
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