I removed the Intel drivers and tried the latest drivers from the Lenovo website - no improvement.I removed the existing Lenovo drivers and tried the latest drivers from Intel - no improvement.BUT a Panasonic TV, connected via HDMI is immediately recognised ("ping"!) and works perfectly!. No monitor (all Dells, mixture of resolutions and DVI or HDMI connectors) are recognised (The Windows "Detect" monitor button claims there are no monitors) note that there is no Windows "ping" to indicate new hardware attached.However first this became unreliable and then stopped working completely after recent Windows updates. I used to be able to plug a second display into the HDMI port of the laptop and either duplicate or extend the desktop. A quick web search indicates that I'm not along in seeing this issue but the symptoms seem a little inconsistent across different makes and models or laptop. If appears that relatively recent Windows 10 updates have broken the "external monitor" function. Can anyone shed any light on a strange issue? I have a laptop (Lenovo) that uses Intel 620 UHD graphics.
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