如果外接显示器无法(external monitor is not working )与您的 Windows 11/10 笔记本电脑配合使用，或者您的Windows PC 未检测到第二台显示器(Windows PC is not detecting the second monitor)，这里有一些解决方案可以帮助您解决此问题。
未检测到笔记本电脑(Laptop)外接显示器
在尝试任何这些建议之前，您应该检查您的第二台显示器是否接收到正确的电源。只需(Just)插入电源线并检查它是否显示制造商的徽标或显示无信号(No Signal)。这样，您就可以确认您的显示器是否正常供电。完成后，继续我们的建议：
- 与另一个设置进行交叉检查
- 检查源检测
- 安装或卸载(Uninstall)并重新安装显示(Re-install Display)驱动程序
- 在兼容模式下检查驱动程序
- 回滚驱动程序
- 更改刷新率。
- 启用监视器
您需要管理员权限才能遵循其中一些方法。
1]与另一个设置交叉检查
检查您的第二台显示器是否与另一台计算机正常工作。建议在将其连接到另一台 PC 或机器时使用相同的HDMI端口。(HDMI)这样，您将能够确保HDMI端口已启动并运行。同样，您应该检查用于将第二台显示器连接到Windows 10笔记本电脑的HDMI电缆。(HDMI)如果您使用任何类型的转换器，建议您验证它是否也与其他设置一起使用。
相关(Related)：在 Windows 11 中未检测到第三个监视器
2]源检测
即使您已正确配置所有内容，如果未正确选择“源”，您的第二个显示器也可能无法工作。几乎每个监视器都有一个类似的选项来确定是由用户还是机器本身选择源。如果设置为Manual，则需要检查是否选择了HDMI。或者，您可以简单地选择自动(Auto )模式。
3]安装(Install)或卸载(Uninstall)并重新安装显示(Re-install Display)驱动程序
如果您的 Windows 10 笔记本电脑有专用显卡，您可能需要更新显卡驱动程序(update Graphics Drivers)。或者，您可以考虑卸载并重新安装图形驱动程序。
4]在兼容模式下检查驱动程序(Check)
如果您的系统重新安装后仍无法正确检测到显卡驱动程序，则应在兼容模式下检查驱动程序。为此，下载您要安装的驱动程序并右键单击它以选择Properties。现在切换到“兼容性”选项卡，选中“(Compatibility )以兼容模式运行此程序(Run this program in compatibility mode for)”复选框，从下拉菜单中选择所需的操作系统，然后单击“应用(Apply )”按钮。
5]回滚驱动程序
如果您在更新驱动程序后遇到此问题，则应将其回滚。为此，请按Win + X，然后选择Device Manager。打开设备管理器(Device Manager)后，右键单击图形驱动程序>选择属性(Properties)>切换到驱动程序(Driver )选项卡>单击回滚驱动程序(Roll Back Driver)。
6]更改刷新率
显示器刷新率在将两台显示器连接到同一系统时起着至关重要的作用。如果两台显示器的刷新率不同，您可能会遇到将它们连接在一起的问题。因此，如果Windows 10(Windows 10)系统检测到第二台显示器，但它显示空白屏幕，则应遵循此建议。Press Win + I 打开Windows 设置面板(Windows Settings Panel)。转到System > Display。现在选择右侧的第二个监视器，然后单击名为“显示适配器属性(Display adapter properties)”的选项。
之后，切换到监视器(Monitor )选项卡并尝试更改刷新率。
7]启用监视器
当您已经有 2 台显示器并连接了第三台显示器时，即使新显示器在Windows 设置(Windows Settings)中可见，它也可能不会显示任何内容。这是正常行为，您需要做的就是打开它。
转到Windows Settings > System Display Advanced Display。选择您的显示器，并确保关闭选项 -从桌面删除(Desktop)显示(Display)。
相关(Related)：修复 Windows 11/10 上的通用 PnP 监视器驱动程序问题(Fix Generic PnP Monitor driver issue)。
为什么检测到我的显示器但不显示？
转到Settings > System > Display >在多个显示器部分下，单击检测(Detect)其他显示器。Windows将检查任何已连接显示器的硬件级别并将其显示在此处。
如何重置我的显示器？
该选项内置于显示器中，可以使用物理按钮完成。检查显示器侧面或后面的电源按钮。然后您可以长按它并打开更多选项。这些选项允许您校准显示器的显示并提供重置选项。完成后，显示器将使用出厂设置。
Windows 未在显示器边缘正确显示
如果Windows看起来被裁剪，或者您在显示屏的一侧有空白区域，那么您需要使用显示屏上的硬件按钮。内部菜单之一将允许您移动显示器，以便它可以从边缘匹配到边缘。
All the best!
External monitor not detected with Windows laptop
If the external monitor is not working with your Windows 11/10 laptop or your Windows PC is not detecting the second monitor, here are some solutions which may help you troubleshoot this problem.
Laptop external monitor not detected
Before trying any of these suggestions, you should check whether your second display is receiving proper power or not or not. Just plug in the power cord and check if it displays the manufacturer’s logo or displaying No Signal. That way, you would be able to confirm that your monitor is getting power properly. Having done that, proceed with our recommendations:
- Crosscheck with another setup
- Check Source detection
- Install or Uninstall & Re-install Display driver
- Check the driver in compatibility mode
- Roll Back driver
- Change the Refresh Rate.
- Enable Monitor
You will need admin permission to follow some of these methods.
1] Crosscheck with another setup
Check whether your second display is working properly with another computer or not. It is recommended to use the same HDMI port while connecting it to another PC or machine. In this way, you would be able to ensure that the HDMI port is up and running. Similarly, you should check the HDMI cable that you are using to connect the second display to the Windows 10 laptop. If you are using any kind of converter, it is suggested to verify that it is working with another setup as well.
Related: Third monitor not detected in Windows 11
2] Source detection
Even if you have configured everything correctly, your second display may not work if the “Source” is not selected properly. Almost every monitor has a similar option that determines whether the source will be selected by the user or the machine itself. If it is set to Manual, you need to check whether HDMI is selected or not. Alternatively, you can simply opt for the Auto mode.
3] Install or Uninstall & Re-install Display driver
If your Windows 10 laptop has a dedicated graphics card, you may need to update Graphics Drivers. Alternatively, you may consider uninstalling and reinstalling the graphics driver.
4] Check driver in compatibility mode
If your system does not detect the graphics driver properly even after reinstallation, you should check the driver in compatibility mode. For that, download the driver that you want to install and right-click on it to select Properties. Now switch to the Compatibility tab, select the checkbox that says Run this program in compatibility mode for, select the desired OS from the drop-down menu and hit the Apply button.
5] Roll Back driver
If you face this issue after updating your driver, you should roll it back. For that, press Win + X, and select Device Manager. After open Device Manager, right-click on the graphics driver > select Properties > switch to Driver tab > click on Roll Back Driver.
6] Change the Refresh Rate
The Monitor Refresh Rate plays a vital role while connecting two monitors to the same system. If the refresh rate of both monitors is different, you might face problems connecting them together. Therefore, if the second monitor is being detected by the Windows 10 system, but it is showing a blank screen, you should follow this suggestion. Press Win + I to open Windows Settings Panel. Go to System > Display. Now select the second monitor on the right-hand side and click on the option called Display adapter properties.
After that, switch to the Monitor tab and try to change the refresh rate.
7] Enable Monitor
When you already have 2 monitors and a third monitor is connected, it is possible that the new monitor will display nothing even though it is visible in the Windows Settings. This is normal behavior, and all you need to do is turn it on.
Go to Windows Settings > System Display Advanced Display. Select your monitor, and make sure to toggle off the option—Remove Display from Desktop.
Related: Fix Generic PnP Monitor driver issue on Windows 11/10.
Why is my monitor being detected but not displaying?
Go to Settings > System > Display > Under multiple displays section, click on Detect other display. Windows will check on a hardware level for any connected monitor and display it here.
How do I reset my monitor?
The option is built into the monitor and can be done using the physical buttons. Check for the power button on the side or behind the display. You can then long-press it and open more options. These options allow you to calibrate the display of the monitor and also offer a reset option. Once done, the monitor will use the factory settings.
Windows is not getting displayed properly on the edge of the monitor
If Windows looks cropped o you have blank space on one side of the display, then you need to use the hardware button on the display. One of the internal menus will allow you to move the display so it can be matched from edge to edge.
All the best!
