How do I reset my HP EliteBook 840 G11 if it is unresponsive?
Press and hold the Power button for at least 4 seconds to completely shut down the computer. If the issue persists, try initiating a BIOS update or clearing the CMOS settings as detailed in the manual’s Computer Setup section (Page 75).
From the official HP Elitebook 840 14 Inch G11 Notebook PC manual, page 23
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