Hi All,

I have been struggling to resolve this problem for long time as well!!

But I am able to fix it by following a method that I saw online. I unplug everything from my laptop and leave it alone. Then long press the power button for 40 seconds, have to be exactly 40 seconds! Then turn on the laptop and connect all cable, HDMI/USBC wire.

It works well now! I am about to connect two monitors at the same time !

I can't thank you enough~!!

I struggled for a couple of hours trying to get it to work after some updates and holding the power button like that and following this actually worked!!!!!!

Thank you thank you thank you

Hi MN. I'm Greg, 10 years awarded Windows MVP, here to help you.

1. Try these fixes for USB C Displayport not working:

https://windowsreport.com/usb-c-displayport-cab...

(Avoid ad links which intrude into editorial copy, especially DO NOT INSTALL Restoro, PC Repair Tool and Reimage ads)

https://forums.tomshardware.com/threads/usb-c-t...

https://itechbrand.com/usb-c-displayport-cable-...

https://techcult.com/fix-windows-10-displayport...

https://helpdeskgeek.com/help-desk/no-displaypo...

2. The Display driver is so important here that merely updating it is sometimes not enough. So let's try everything possible to get it working correctly:

First make sure you have updated the Display driver from the PC or motherboard maker's Support Downloads web page for your exact model number, HP Serial Number or Dell Service Tag - from the sticker on the PC.

If necessary first remove the old driver using DDU https://www.wagnardsoft.com/content/ddu-guide-t... (not necessary with Microsoft Basic driver which is a placeholder if nothing else is available) and/or installing in Safe Mode with Networking (so you have internet), or Safe Mode, accessed by one of these methods: https://www.digitalcitizen.life/4-ways-boot-saf...

While there check also for newer chipset, BIOS/UEFI firmware (very important), network, sound, USB3, USBC and other drivers, comparing to the ones presently installed in Device Manager reached by right clicking the Start Menu.

If this doesn't give you the latest or ideal driver for what you need, compare it to the driver offered by the Intel driver update Utility here: http://www.intel.com/content/www/us/en/support/...

or the Nvidia Update utility here: http://www.nvidia.com/Download/Scan.aspx?lang=e...

or the AMD autodect utility here: http://support.amd.com/us/gpudownload/windows/P...

For Display issues one fix that is working is to Roll back or Uninstall the Driver on the Display Device > Driver tab, restart PC to reinstall driver.

You can also try older drivers in Device Manager > Display device > Driver tab > Update Driver > Browse > Let Me Pick.

Then try these same steps for the USB-C drivers.

Adjust the screen resolution until it fits and looks best at Settings > System > Display.

Check for a monitor driver by expediting Windows Updates (including Optional Updates) in Settings > Update & Security > Windows Update > Check for Updates to install all Updates until no more are offered.

Report back results for each step so I know what else to suggest.

Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.

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