How do I use the LED Diagnostic viewer for the HP ProBook 440 G8?
To use the LED Diagnostic viewer, first click on the desired external view (Top View, Right Edge, Display View, or Left Edge) to identify LED locations. Then hover over the information icon above any LED to review its diagnostic behavior in the right-hand pane. (Page 1)
From the official HP Probook 440 G8 Notebook PC manual, page 1
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