How do I force shut down the HP EliteBook 840 G5 if it stops responding?
If the computer has stopped responding and normal shutdown procedures are ineffective, press and hold the power button for at least 5 seconds to turn off the computer. Be aware that pressing and holding the power button results in the loss of unsaved information. (Page 25)
From the official HP Elitebook 840 G5 Notebook PC manual, page 25
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