Here is my memory of how this problem developed. HP site suggested an update the sound problem. I downloaded the update, Randy update, after some time elapsed the external monitor remains black. I opened the laptop to view its screen and found the laptop in recovery mode.
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Let's try the system restore and check:
This document explains how to use and troubleshoot the System Restore feature in Windows 10 and Windows 8. Click here
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ECHO_LAKE I am an HP Employee
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