Surface laptop 4 second monitor flickers and goes black on surface dock

Question

My surface laptop 4's second monitor flickers and then goes black on the surface dock. The first monitor works fine. A USB monitor on a USB cable is completely black. The same monitor and cable work fine on my Surface laptop 5. This all used to work for the last two years up until today.

Answer 1

Hi Scott Doig,

Since the monitors, cables and Surface Dock continue to work with your Surface Laptop 5 and the same setup worked normally with your Surface Laptop 4 until recently, it would be helpful to narrow down whether the issue is related to the dock connection path, Windows or the Surface Laptop 4 itself.

If you have a compatible USB-C display adapter available, could you try connecting one of the affected monitors directly to the Surface Laptop 4, bypassing the dock entirely? Test the monitor for a while to see whether the flickering or black screen still occurs. If the monitor works normally without the dock, that suggests the issue is more likely related to the dock connection path rather than the monitor itself.

You can also check whether Windows is still detecting all connected displays. Open Settings > System > Display and select Detect if the second monitor is not shown. If Windows does detect the monitor, try selecting it and switching between display modes such as Extend, Duplicate or temporarily disconnecting and reconnecting the display within the settings. This can force Windows to renegotiate the connection with the monitor.

Another step worth trying is rebuilding the monitor configuration in Device Manager. Open Device Manager, select View > Show hidden devices, then expand Monitors. Uninstall the affected external monitor entries, restart the Surface Laptop 4 and reconnect the dock and monitors. Windows will automatically rediscover the displays and create a fresh monitor configuration, which can sometimes resolve display detection issues.

Because the problem appeared suddenly after working correctly for a long time, it may also be helpful to perform a clean boot. This starts Windows with only essential Microsoft services and drivers, which can help determine whether a recently installed application, display utility, graphics enhancement tool or third-party service is interfering with the external displays. If the monitors work normally after a clean boot, that will suggest a software conflict is involved.

*Disclaimer: A "clean boot" starts Windows with a minimal set of drivers and startup programs. It helps to determine whether a background service is interfering with your game or program and to isolate the cause of a problem. 

These steps of "clean boot" might look complicated at first glance. However, to avoid any trouble for you, please follow them in order and step-by-step so that it will help you get back on track. 

Please let me know how it goes and I'll glad to assist further.

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