One of the features of Windows 10 that gamers and content creators like is the ease of adding additional monitors to the system. This additional monitor will improve productivity or enhance the gaming experience. If your graphics card has multiple video output ports then you will be able to connect multiple monitors to it. Sometimes though, certain issues can occur when using a multiple monitor setup. In this latest installment of our troubleshooting series we will tackle the windows 10 second monitor not detected issue. How To Fix Windows 10 Second Monitor Not Detected Issue Before performing any of the recommended troubleshooting steps listed below it\u2019s best to restart your computer first. This action refreshes the operating system and remove any corrupt temporary data that could be causing the problem. Change the projection mode The first thing you will need to do in this case is to make sure that you have properly set the projection mode of Windows 10. This allows the graphics card to act on what to do with the second monitor. Press the Windows + P keys to open Projection modeChoose proper projection mode between four options: PC screen only ( for single monitor iuse), Duplicate ( for multiple monitor use), Extend ( for multiple monitor use), Extend ( for multiple monitor use), Second screen only. Check if the Windows 10 second monitor not detected issue still occurs. Turn off computer and monitor Try refreshing the whole system by turning off the computer and monitor. You should also disconnect the connection of the monitors from the computer. Turn OFF your computer.Turn OFF your monitorsUnplug all power cables from computers and monitors.Unplug all cables between computers and\u00a0 monitors.Wait few minutesPlug all cables back inTurn ON your computer and monitors Check if the Windows 10 second monitor not detected issue still occurs. Refresh the display adapters Hold Windows logo and press RType devmgmt.msc and press EnterNavigate to Display adapter and choose your graphic cardRight click on graphic card and select DisableRight click on graphic card and select EnableRestart your machineProject your screen on second monitor Check if the Windows 10 second monitor not detected issue still occurs. Reinstall the monitor driver Hold Windows logo and press RType devmgmt.msc and press EnterNavigate to Monitors and choose your monitorRight click on your monitor and choose UninstallClick Uninstall to confirm uninstalling monitorRestart your computerProject your screen on second monitor Check if the Windows 10 second monitor not detected issue still occurs. Turn on multiple display from Nvidia control panel If you are using an Nvidia graphics card then try turning on the multiple display setting from the Nvidia control panel. Click Start menu and type NVIDIA Control PanelOpen NVIDIA Control PanelChoose DisplayClick Set up multiple displaysSelect displays you want to useClick SaveRestart your computer Check if the Windows 10 second monitor not detected issue still occurs. Other steps to try Try using a different cable to connect the monitor and computer.Try updating the graphics card driver.Make sure the motherboard is running on the latest BIOS version.