Second Monitor not Working
With polls showing that more users are dabbling in multiple-monitor setups and studies proving that having more than one monitor correlates with productivity increases, there's plenty of justification for a two-monitor layout becoming the standard for PC users. Users who can't get their second monitor to work as advertised may not have a malfunctioning monitor – they may have a minor software or configuration problem that's worth correcting. Run through some of the best ways of correcting a multi-monitor display before assuming that the second monitor doesn't work.
Always check for the appropriate drivers when installing new hardware. Outdated drivers may not provide full support for relatively new features like Windows 10's support for multiple monitor setups. Check the drivers for your graphics card and monitors by opening the Device Manager (type its name in the taskbar and click the top result). Any monitors are under the 'Monitors' section; graphics cards are in 'Display adapters.' Double-click the categories for expanding them to show all devices. Right-click the device, choose Properties and change the new window to the Driver tab. You should identify whether or not you have the latest patch from the version and date fields.
The 'Update Driver' button on the same window is a possible means of updating the driver. For optimizing accuracy, experts suggest that users search manufacturer websites for the latest driver for their product, and download it. The Windows driver-finding feature isn't always accurate at identifying the latest updates for non-Microsoft-supported products.
After determining whether or not your drivers are in order, check any cables (such as HDMI, VGA, etc.) for compatibility and potential problems. Turn off the computer and re-seat the cord on both ends; the system may not detect some devices until the user does this and goes through a full reboot. Be mindful of obstructions or loosely-fitting plugs.
Some solutions also are specific to Wi-Fi-based secondary monitors. When troubleshooting, confirm that both the PC and the extra monitor are sharing the same-name network channel and not automatically connecting to different ones. Many systems will auto-connect to the 'strongest' signal, which can change from device to device.
The casting feature will let you stream a media file (such as a movie) to the Wifi monitor. Usually, it should be available as an option when you right-click an appropriate file like an AVI. Note that the 'cast to device' feature also displays a list of available monitors. If your second monitor doesn't appear, it may not be in the right network or have other compatibility problems. You also may need to enable the Network Sharing feature. Type 'Network Settings' in the taskbar and click the result. Click Wifi, Advanced Sharing Options (you may need to scroll down), and click 'Turn on printer and file sharing.'
You also may duplicate or project your entire screen on the second monitor. Use the projection feature by hitting the Windows key and P and choose the appropriate option from the menu.
Most issues with a second monitor should correct themselves with the above steps. Users experiencing further issues should check with the manufacturer for recommended solutions.