Duplicate these displays: This setting will duplicate your laptop screen image on both monitors based on the monitor with the lower resolution. If it does not work, try restarting your computer and repeat steps 1 and 2. If you cannot see the additional monitor(s) listed, click Detect.
If the displays and any adapters in use appear to work normally, make sure both the Intel video drivers and nVIDIA drivers are updated to the latest released on the Drivers and Downloads support site. If you have any docks or adapters in your configuration these can be a common point of failure, testing monitors individually with these components remove should help narrow down the point of failure.
I’d first suggest checking the monitor’s connection to the M3800 / confirming they work on another system if available.