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We have several HP EliteBook 840 G7s that have started to refuse to connect to external monitors via the USB-C ports - This functionality was working before December 2023 but has suddenly stopped working (The HDMI port still works).

Tested with fresh installs of both Windows 10 and Windows 11 using multiple display/adapter combinations plus HP docks (all confirmed as working before testing) and all drivers including dock drivers up to date no external monitor is being recognised via USB-C. 

Adapters tested: USB-C to HDMI, USB-C to VGA, USB-C to Displayport
Docks Tested: HP USB-C Dock G5, HP Thunderbolt Dock G5. 

Tested the available DP alt modes in the BIOS and reset BIOS to factory - Issue still present.

USB-C ports still recognise other devices including the docks, flash drives etc - Only display output affected.

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