Introduction

Upgrading older hardware can be challenging, especially when it comes to maintaining functionality across different operating systems. Using an iMac as an external monitor for a Windows PC might seem like a way to repurpose your older iMac—but it involves some workarounds and limitations. In this article, we explore the methods to achieve this and provide guidance on the best options for your needs.

Why Use an iMac as an External Monitor?

With the rapid advancement in technology, older Macs like the iMac can become obsolete, especially when newer operating systems and hardware updates no longer support them. While this can make them a valuable antique for tech enthusiasts, it can also result in a less useful device. Utilizing an older iMac as an external monitor can breathe new life into your device, providing a high-quality display for your Windows PC. This can be particularly useful for professionals who require a large, high-resolution display while maintaining a powerful Windows system.

Compatibility and Limitations

It's important to note that iMacs do not natively support video input from other computers, which presents a challenge when trying to use an iMac as an external monitor for a Windows PC. However, there are several methods that can help you achieve this goal.

Method 1: Target Display Mode (For iMacs 2011-2014)

Target Display Mode is a feature that allows you to use an iMac as an external monitor for another Mac. This method, although simple, does not work with a Windows PC. If you have an older iMac from the 2011-2014 period, you can follow these steps:

Connect your Mac and iMac using a Thunderbolt or Mini DisplayPort cable.

Press Command (?) F2 on the iMac's keyboard to enter Target Display Mode.

Note that this method is not applicable for a Windows PC, and it also requires both computers to be running Apple's operating systems.

Method 2: Third-Party Software Solutions

For newer iMacs or to use your iMac as an external monitor for a Windows PC, third-party software solutions offer a more flexible and powerful solution:

Duet Display: Install Duet Display on both the iMac and the Windows PC. Connect the iMac and Windows PC via USB or over Wi-Fi, and launch the application to use the iMac as a second display.

Air Display: Similar to Duet Display, install Air Display on both devices and connect them following the instructions to extend your display.

Spacedesk: Install Spacedesk on the Windows PC, access the Spacedesk viewer on the iMac via a web browser, and use the iMac as a second monitor over the network.

These software solutions provide a seamless way to extend your Windows PC display onto your iMac, making it a practical option for those who need a high-resolution monitor.

Method 3: Hardware Solutions

If you prefer a more traditional setup, hardware solutions offer a direct and reliable method for extending your Windows PC display:

Capture Card: Purchase a video capture card that supports HDMI input. Connect the Windows PC to the capture card via HDMI, and connect the capture card to the iMac via USB. Use the software that comes with the capture card to display the Windows PC screen on the iMac.

Hardware methods like these can provide a higher resolution and performance, though there might still be some limitations such as lower resolution support.

Conclusion

While it is not straightforward to use an iMac as an external monitor for a Windows PC, you can leverage workarounds and solutions to achieve the desired effect. Third-party software and hardware solutions offer various options to suit your specific needs, whether you require a high-performance setup or a more flexible one. Consider your requirements and choose the method that best fits your configuration and usage.