Hi Sherm,
Thank you for posting in Microsoft Community.
Based on the description you posted, you have an issue with Surface laptop 4 wherein the device will not recognize the dock in the USB-C to connect to the second screen. This may be caused by the dock 2 not being connected properly or needing to update the driver of the Surface dock 2.
Let’s work together in finding the best solution to this issue. To get started I will ask a few questions to further isolate the issue.
- When you try to connect the monitor to the dock 2 did you find any error message display on the Surface or just black screen.
- When you connect the USB-C to HDMI cable to the Surface dock 2 did you connect at the back of the dock?
The two USB-C port in front of the Surface dock 2 is only use for data transfer.
We will take some basic troubleshooting steps to further fix the issue.
- Please connect the Surface dock 2 to the Surface using the Surface connect port.
- Next, please connect the USB-C to HDMI cable at the back of your Surface dock going to the HDMI port of the monitor.
- After you connect the 2 USB-C to HDMI at the back of the monitor.
- Please turn on both monitor
- Next, Press the Windows logo key + P on your keyboard to open Project. Then, select “Extend” to extend your display to the Samsung monitors.
If the above steps don’t work, you can try resetting your MS Surface Dock 2 by following these steps:
- Disconnect all cables from your MS Surface Dock 2.
- Unplug the power cord from your MS Surface Dock 2.
- Wait for 10 seconds.
- Plug the power cord back into your MS Surface Dock 2.
If still not working, please also install the driver pack on the Surface dock. Download Surface Dock 2 Firmware and Drivers. from Official Microsoft Download Center
You can also check this link for more information about the Surface dock Identify your Surface Dock and features - Microsoft Support and Troubleshoot Surface Dock or Surface Docking Station - Microsoft Support
Please tell me how it goes.
Kind regards,
Christopher