除了许多实用程序之外，第二台显示器可能对工作有益。但是，尽管在某些情况下第二台显示器连接到系统，Windows 无法检测到它并发送消息，例如 – Windows 无法检测到第二台显示器(Windows cannot detect the second monitor)或未检测到另一台显示器(Didn’t detect another display)。虽然原因可能很多，但我们可以将其缩小到几个。如果它与软件有关，它可能会追溯到驱动程序。它适用于Windows 11和Windows 10。
Windows 11/10中未检测到第二个监视器(Monitor)
在开始之前，请确保您的Windows已安装所有最新的Windows 更新(Windows Updates)，您的第二个显示器硬件正常工作，并且您已正确设置双显示器(set up the dual monitors)。这是所有外接显示器的常见问题之一，即使您设置了第三台显示器也会发生。
- 重新启动您的 Windows PC
- 强制 Windows 检测第二台 PC显示器(Monitor)
- 检查您的显示适配器
- 更新(Update)、重新安装(Reinstall)或回滚(Or Roll Back)图形驱动程序(Graphics Driver)
- 硬件故障排除
- 连接无线显示器
您需要清楚了解Windows的技术部分和管理员帐户。
1]重新启动您的Windows PC
重新启动 Windows PC 可以解决很多问题(Restarting a Windows PC can solve so many problems)，以至于我们大多数人都会花费数小时对其进行故障排除。虽然它是已知且常见的，但如果您还没有，请重新启动计算机。此外，请确保您没有出现诸如拔线、断开显示线等基本问题。
2]强制Windows(Force Windows)检测第二台PC显示器(Monitor)
如果您的操作系统无法检测到另一台显示器，请右键单击Start，选择 Run(Select Run)，然后在Run框中键入desk.cpl并按(desk.cpl)Enter打开Display Settings。通常，应该会自动检测到第二台显示器，但如果没有，您可以尝试手动检测。
- 单击(Click)“开始(Start)”按钮，然后单击像符号一样的齿轮以打开“设置”(Settings)应用程序。
- 转到系统，(System,)然后在显示选项卡中，在多个显示(Multiple Displays)列下，单击“检测(Detect)”。此按钮可帮助操作系统检测其他监视器或显示器，尤其是在它们是旧型号的情况下。您还可以在此处连接到无线显示器。
此外，确保正下方的栏设置为扩展这些显示(Extend these displays)。如果是仅在 1 上显示或仅在 2 上(Show)显示(Show)，那么这就是您的问题。这些选项将禁用其中一个外部显示器。
如果这也不起作用，请转到System > Display > Advanced显示，然后选择您的显示器。然后检查选项 - 从桌面删除显示是否已打开。如果是，那么你打开。您的显示器现在应该可用。
3]检查您的显示适配器
您可以手动安装或更新Display Adapter使用的驱动程序。但是，为此，您需要检查OEM。
使用WIn + X打开设备(Device)管理器，然后按 M 键。找到显示(Display)适配器列表并将其展开。根据板载GPU(GPUs)的数量，您可能会看到一两个这样的适配器。
要识别OEM，请查看名称。它通常是Intel或NVIDIA。如果您需要更新现有的设备驱动程序，您必须右键单击它并单击属性以打开显示适配器(Display Adapter)属性。然后切换到驱动程序(Driver)选项卡。检查驱动程序的版本。下一步是访问OEM网站并下载驱动程序更新。然后您可以手动选择更新显卡驱动程序。
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)。
4]更新，(Update)重新安装(Reinstall)或回滚(Or Roll Back)图形驱动程序(Graphics Driver)
通常情况下，Windows无法找到第二台显示器与显卡有关。它无法检测到第二个显示器，因为视频卡或显卡没有安装最新驱动程序的正确驱动程序。因此，您需要更新显示适配器(Display adapters)和显示器的显示驱动程序。您(Monitors. You )可能需要更新或重新安装您的NVIDIA驱动程序。查看我们关于如何更新设备驱动程序(update the device drivers)的详细指南。
如果更新驱动程序不起作用，您可以重新安装它们：(If updating the drivers doesn’t work, you can re-install them:)
- 转到Windows key + X键，然后选择设备管理器。 (Device Manager. )
- 在设备管理器窗口(Device Manager Window)中找到相关的驱动程序。如果您看到一个黄色感叹号，请右键单击它并选择回滚(Rollback)以 将驱动程序回滚到以前的版本。
- 如果该选项不可用，请右键单击它并选择Uninstall。重新启动系统。
- 再次打开设备管理器(Devices Manager)并选择扫描硬件更改(Scan for hardware changes)以安装驱动程序。
最后，如果在安装新驱动后出现问题，您可以选择回滚驱动——右键单击设备管理器(Device Manager)中的显示(Display) 适配器(Adapters)并选择属性。然后切换到驱动程序(Driver)选项卡，然后单击回滚驱动程序(Roll Back Driver)按钮。
Windows 将卸载当前驱动程序并使用旧驱动程序，该驱动程序将作为备份保留几天。
5]硬件故障排除
- 尝试更换连接第二台显示器的HDMI电缆。(HDMI)如果它有效，我们就知道之前的电缆有问题。
- 尝试将第二台显示器与不同的系统一起使用。这将有助于确定问题出在监视器还是主系统上。
- 运行硬件和设备疑难解答并查看。
6]连接无线显示器
无线显示(Wireless Display)是扩展显示的绝佳选择，如果显示器不工作，可用作临时解决方案。同时，您可以连接到另一台 PC 并检查显示器是否在该 PC 上正常工作。
为什么我的显示器无法识别HDMI？
如果连接了HDMI电缆，但您的 PC 仍然无法识别您的显示器，则可能是硬件问题。您可以使用另一根HDMI电缆、使用同一根电缆的备用显示器或另一台显示器上的设备检查问题。如果线和显示器正在与另一台计算机一起使用，那么它是GPU或主板端口(Motherboard Port)问题。您可能需要更换或联系服务中心进行修复。
我需要连接到GPU HDMI或主板 HDMI(Motherboard HDMI)吗？
大多数CPU(CPUs)都有板载GPU，通过主板HDMI工作。如果您有外部GPU或显卡，则需要连接到GPU HDMI端口。外部GPU将接管板载GPU。因此，您需要检查您的显示器连接到哪个HDMI端口，并确保它是GPU端口。
有些CPU(CPUs)没有板载GPU，但用户会因为主板提供GPU 端口(GPU Port)而感到困惑。在这种情况下，您还需要将HDMI线连接到GPU端口而不是主板显示端口。
我需要在主板上启用HDMI输出吗？(HDMI)
这种情况很少发生，但如果UEFI或BIOS提供启用和禁用HDMI端口的选项，则应该启用它。您需要通过按 F2 或Del键并在计算机启动时更改显示部分下的设置来启动UEFI 。
大多数时候，Windows可以轻松检测到外部显示器或监视器而不会出现问题。但是，有时Windows或驱动程序中的设置可能会破坏体验。我希望这篇文章很容易理解，你终于可以检测到第二台显示器了。如果您有任何其他想法，请告诉我们。
Windows cannot detect the second monitor - Windows 11/10
Other thаn its many utilitiеs, a ѕecond monitor could be beneficiаl for work. Howevеr, despite the second monitor being connected to thе system іn some situations, Windows cannot detect it and sends a message like – Windows cannot detect the second monitor or Didn’t detect another display. While the reasons could be many, we could narrow it down to a few. If it’s with the software, it could probably be traced to the drivers. It is applicable for Windows 11 and Windows 10.
Second Monitor not detected in Windows 11/10
Before you begin, make sure that your Windows has all the latest Windows Updates installed, your second monitor hardware is working, and you have properly set up the dual monitors. It is one of the common problems with all external monitors and happens even when you set up a third monitor.
- Restart your Windows PC
- Force Windows to Detect the Second PC Monitor
- Check Your Display Adapter
- Update, Reinstall, Or Roll Back The Graphics Driver
- Hardware troubleshooting
- Connect a Wireless Display
You will need a clear understanding of the technical parts of Windows and an administrator account.
1] Restart your Windows PC
Restarting a Windows PC can solve so many problems that most of us will spend hours troubleshooting it. While it’s know and common, if you haven’t, restart your computer. Also, make sure you don’t have basic issues such as unplugged wire, disconnected display wires, and so on.
2] Force Windows to Detect the Second PC Monitor
If your operating system cannot detect the other monitor, right-click on Start, Select Run, and type desk.cpl in the Run box and hit Enter to open the Display Settings. Usually, the second monitor should be detected automatically, but if not, you can try detecting it manually.
- Click on the Start button and then on the gear like a symbol to open the Settings app.
- Go to System, and in the Display tab, under the Multiple Displays column, click on “Detect.” This button helps the OS detect other monitors or displays, especially if they are older models. You can also connect to a wireless display here.
Also, make sure that the bar directly below is set to Extend these displays. If it is anything else like Show only on 1 or Show only on 2, then that is your problem. These options will disable one of the external displays.
If this also doesn’t work, Go to System > Display > Advanced display, and select your monitor. Then check if the option—Remove display from desktop, is toggled on. If yes, then you turn in on. Your monitor should now be available.
3] Check Your Display Adapter
You can manually install or update the drivers used by Display Adapter. However, to do that, you will need to check the OEM.
Open Device manager using WIn + X, followed by press the M key. Locate the Display adapters listing and expand it. Depending on the number of GPUs onboard, you may see one or two such adapters.
To identify the OEM, look at the name. It would usually be Intel or NVIDIA. If you need to update the existing device driver, you must right-click on it and click on properties to open the Display Adapter properties. Then switch to the Driver tab. Check the version of the driver. The next step is to visit the OEM website and download the driver updates. You can then manually choose to update the graphics card driver.
Related: Fix Generic PnP Monitor driver issue on Windows 11/10.
4] Update, Reinstall, Or Roll Back The Graphics Driver
More often than not, the inability of Windows to find the second monitor has to do with the video card. It can’t detect the second display because the video card or graphics card does not have the correct drivers of the latest drivers installed. So you need to update the display drivers for—Display adapters and Monitors. You may need to update or reinstall your NVIDIA driver. Check out our detailed guide on how to update the device drivers.
If updating the drivers doesn’t work, you can re-install them:
- Go to Windows key + X key and then choose Device Manager.
- Find the concerned driver in the Device Manager Window. If you see a yellow exclamation mark against it, right-click on it and select Rollback to roll back the driver to its previous version.
- If that option is not available, right-click on it and select Uninstall. Restart the system.
- Open Devices Manager again and select Scan for hardware changes to install the driver.
Lastly, if the issue occurred after installing a new driver, you can choose to roll back the driver—Right-click on the Display Adapters in Device Manager and select properties. Then switch to the Driver tab, and click on the Roll Back Driver button.
Windows will uninstall the current driver and use the old driver, which is kept as a backup for a couple of days.
5] Hardware troubleshooting
- Try changing the HDMI cable connecting the second monitor. If it works, we know the previous cable was faulty.
- Try using the second monitor with a different system. It would help isolate whether the issue is with the monitor or the primary system.
- Run the Hardware & Devices Troubleshooter and see.
6] Connect a Wireless Display
Wireless Display is a great option to extend your display and can be used as a temporary solution if the monitor is not working. Meanwhile, you can connect to another PC and check if the display works on that PC.
Why won’t my monitor recognize HDMI?
If an HDMI cable is connected, but your PC can still not recognize your monitor, it is likely a hardware issue. You can check on the problem using another HDMI cable, an alternate display using the same cable, or the set on another monitor. If the wire and monitor are working with another computer, then it’s GPU or Motherboard Port problem. You may have to replace or get in touch with the service center to fix it.
Do I need to connect to GPU HDMI or Motherboard HDMI?
Most of the CPUs have onboard GPU, which works through motherboard HDMI. If you have an external GPU or a graphics card, you need to connect to a GPU HDMI port. An external GPU will take over the onboard GPU. So you need to check which HDMI port your monitor is connected to and make sure it is the GPU port.
Some CPUs don’t have onboard GPU, but users get confused because the motherboard offers a GPU Port. In this case, you also need to connect the HDMI wire to the GPU port instead of the motherboard display port.
Do I need to enable HDMI output on the motherboard?
It happens rarely, but if the UEFI or BIOS offers the option to enable and disable the HDMI port, it should be enabled. You will need to boot into the UEFI by pressing the F2 or Del key and changing the setting under the display section when the computer starts.
Most of the time, Windows easily detects external displays or monitors without a problem. However, at times the settings in Windows or the drivers can ruin the experience. I hope the post was easy to follow, and you could finally detect the second monitor. Let us know if you have any other ideas.
