This feature allows a 2017 iMac to be used as an external display for another Mac. Connecting the two machines with a compatible cable triggers this functionality, transforming the 2017 iMac into a monitor for the secondary device. For example, a MacBook Pro could utilize a 2017 iMac’s screen for a larger workspace.
The ability to repurpose the 2017 iMac as a secondary monitor offers significant advantages, particularly for users with limited desk space. It eliminates the need for a separate monitor while leveraging the iMac’s high-resolution display. This functionality was a key feature of iMacs released in that year, extending their lifespan and utility beyond their primary function as a standalone computer. Its availability reflected a trend toward more flexible and interconnected devices within the Apple ecosystem.
This article will further explore the technical specifications, setup process, compatibility requirements, and potential troubleshooting tips associated with using this functionality. Topics covered will include the necessary cables, supported resolutions and refresh rates, and known limitations of the feature.
1. 2017 iMac models
Not all 2017 iMacs support Target Display Mode. Specifically, only the 21.5-inch and 27-inch models released in mid-2017 offer this functionality. Later 2017 models and other iMac generations lack the necessary hardware to function as external displays. This distinction is crucial because attempting to use an incompatible iMac in Target Display Mode will prove unsuccessful. For instance, a late 2017 iMac Pro, despite its powerful specifications, cannot be used as a secondary monitor via this method. Differentiating between compatible and incompatible models is the first critical step for utilizing this feature.
The 2017 models supporting Target Display Mode feature specific Thunderbolt ports capable of receiving video signals from a source Mac. These ports differ from Thunderbolt ports found on later iMacs, which prioritize data transfer and device charging over video input. This hardware distinction explains why Target Display Mode compatibility is limited to these specific models. Using a 2017 27-inch iMac as an external display for a 2015 MacBook Pro demonstrates a practical application, extending the MacBook Pro’s display capabilities by leveraging the iMac’s larger screen. This specific model pairing highlights the cross-generational compatibility possible within this timeframe.
Correctly identifying a mid-2017 21.5-inch or 27-inch iMac is essential for successful Target Display Mode implementation. Checking the model identifier, typically found on the original packaging or within system information, verifies compatibility. This knowledge prevents wasted effort and potential frustration arising from attempting to use unsupported hardware configurations. Understanding this compatibility constraint provides a clear starting point for utilizing Target Display Mode effectively within a multi-Mac workflow.
2. Thunderbolt Cable
The Thunderbolt cable plays a critical role in enabling Target Display Mode on a mid-2017 21.5-inch or 27-inch iMac. It serves as the conduit for transmitting both video and audio signals from the source Mac to the iMac functioning as an external display. Selecting the correct cable is paramount for successful implementation.
-
Cable Type and Compatibility
Not all Thunderbolt cables are created equal. Target Display Mode requires a Thunderbolt 2 cable or a Thunderbolt 3 cable used with a Thunderbolt 2 adapter. Using a standard Thunderbolt 3 cable without the appropriate adapter will not work. A Thunderbolt 2 cable features a Mini DisplayPort connector on both ends, matching the ports on the compatible iMac models and many source Macs of that era. This distinction is vital, as using an incorrect cable prevents Target Display Mode activation.
-
Resolution Limitations
The cable choice can also impact the achievable resolution. While a Thunderbolt 2 cable supports up to 4K resolution, using a Thunderbolt 3 cable with a Thunderbolt 2 adapter can facilitate 5K resolution on a compatible 27-inch iMac. For example, connecting a 5K iMac to a MacBook Pro with a Thunderbolt 2 cable limits the output to 4K, whereas a Thunderbolt 3 cable with an adapter unlocks the full 5K resolution.
-
Cable Length Considerations
Cable length can introduce signal degradation, particularly with longer runs. While shorter cables are generally preferred for optimal signal integrity, longer cables can be utilized if necessary, potentially requiring active Thunderbolt cables for distances beyond a few meters. This factor influences the physical placement flexibility between the two connected devices.
-
Bi-Directionality
Thunderbolt cables support bi-directional data flow. While this isn’t strictly relevant to Target Display Mode, it highlights the versatility of the Thunderbolt interface. In contexts outside of Target Display Mode, the same cable can be used for data transfer, device charging, and other Thunderbolt functionalities. This characteristic contributes to the overall utility of the cable within a broader technological ecosystem.
Understanding the specific requirements of the Thunderbolt cable, including its type, compatibility with the source and target devices, and potential resolution limitations, ensures successful Target Display Mode operation. Selecting the correct cable is a fundamental prerequisite for leveraging this functionality and establishing a seamless dual-display configuration. Neglecting these details can lead to compatibility issues, preventing the iMac from functioning as an external monitor.
3. Compatible Source Mac
Target Display Mode on a 2017 iMac relies on a compatible source Mac to provide the video and audio output. Not all Macs can utilize this feature, and understanding the compatibility requirements is crucial for successful implementation. Connecting an incompatible source will prevent the iMac from entering Target Display Mode and functioning as an external display.
-
Operating System Requirements
The source Mac must run a compatible operating system. Generally, macOS versions contemporary with the mid-2017 iMac release, such as macOS Sierra, High Sierra, and Mojave, support this functionality. Using older or significantly newer macOS versions might present compatibility challenges. Ensuring the source Mac runs a supported operating system is a fundamental prerequisite.
-
Thunderbolt Port Compatibility
The source Mac requires a Thunderbolt port capable of outputting video signals. Thunderbolt 2 ports found on Macs from around the same period as the 2017 iMacs are directly compatible. Macs with Thunderbolt 3 ports can also function as source devices, potentially requiring a Thunderbolt 3 to Thunderbolt 2 adapter for connection to the 2017 iMac. This hardware compatibility is non-negotiable for successful operation.
-
Specific Mac Model Compatibility
While many Macs from the mid-2010s through the late 2010s are compatible, exceptions exist. Consulting Apple’s official documentation provides a definitive list of supported Mac models. For instance, a 2015 MacBook Pro or a 2016 Mac mini are generally compatible sources, but a 2012 Mac Pro might not be. Verification ensures compatibility and avoids potential setup issues.
-
Software and Firmware Updates
Maintaining up-to-date software and firmware on both the source Mac and the target iMac can improve compatibility and resolve potential issues. Occasionally, software updates address bugs affecting Target Display Mode functionality. Keeping both machines updated ensures optimal performance and stability within this configuration.
Selecting a compatible source Mac is as crucial as choosing the correct iMac model and cable. These components form a tightly integrated system, and compatibility between them is essential for utilizing Target Display Mode successfully. Verifying these requirements prevents wasted effort and frustration, ensuring a seamless dual-display setup leveraging the 2017 iMac’s capabilities as an external monitor.
4. Resolution and Refresh Rate
Achieving optimal visual quality when using a 2017 iMac in Target Display Mode requires careful consideration of resolution and refresh rate. These factors directly impact the clarity, smoothness, and overall viewing experience on the iMac’s display. Understanding the interplay between the source Mac’s capabilities, the iMac’s display specifications, and the connecting cable is essential for maximizing visual fidelity.
-
Supported Resolutions
The maximum supported resolution depends on the specific iMac model and the connection type. 27-inch 2017 iMacs with 5K displays can support their native resolution when connected to a compatible source Mac using a Thunderbolt 3 cable and a Thunderbolt 2 adapter. However, using a Thunderbolt 2 cable limits the resolution to 4K. 21.5-inch models support their native resolutions. For example, a 5K iMac used with a 4K source will display at 4K, effectively downscaling the source output. Understanding these limitations is crucial for setting realistic expectations regarding image quality.
-
Refresh Rates
Refresh rate, measured in Hertz (Hz), determines how many times per second the display refreshes the image. A higher refresh rate results in smoother motion and reduced motion blur. Target Display Mode typically supports standard refresh rates like 60Hz. While some newer displays support higher refresh rates, these are generally not available when using an iMac in Target Display Mode. For instance, a source Mac capable of outputting at 120Hz will be limited to the iMac’s standard refresh rate, typically 60Hz.
-
Impact of Cable Choice
As previously discussed, the Thunderbolt cable used to connect the source Mac and the iMac influences the achievable resolution. A Thunderbolt 2 cable limits the maximum resolution to 4K, even if both the source and the iMac support 5K. Using a Thunderbolt 3 cable with a Thunderbolt 2 adapter is necessary to unlock the full 5K resolution on compatible iMacs. This underscores the importance of selecting the appropriate cable for the desired resolution.
-
Scaling and Aspect Ratios
When the source resolution differs from the iMac’s native resolution, scaling occurs. The iMac will either upscale or downscale the source image to fit its display. This can introduce minor image quality changes. Maintaining the correct aspect ratio is also crucial to avoid image distortion. For example, displaying a 16:9 aspect ratio source on a 16:10 display will result in letterboxing or pillarboxing unless scaling adjustments are made.
Selecting the appropriate resolution and understanding the refresh rate limitations inherent in using a 2017 iMac in Target Display Mode is vital for an optimal viewing experience. These factors, combined with the correct cable and compatible source Mac, determine the overall image quality and contribute significantly to the effectiveness of this dual-display configuration. Ignoring these considerations can result in a suboptimal visual experience, diminishing the benefits of utilizing the iMac as an external monitor.
5. Startup Key Combination
Activating Target Display Mode on a 2017 iMac requires a specific startup key combination. This process differs from simply connecting the two Macs. Understanding and correctly executing this key combination is crucial for initiating the Target Display Mode functionality and utilizing the iMac as an external display.
-
Timing of Key Press
The key combination must be pressed immediately after powering on the iMac. Holding the keys down before powering on or pressing them too late in the startup sequence will not activate Target Display Mode. The timing is critical and requires precise execution during the boot process. A delayed key press results in the iMac booting normally, requiring a restart and another attempt.
-
Specific Key Combination
The required key combination is Command () + F2. These keys must be pressed simultaneously and held until the iMac enters Target Display Mode. Using other key combinations or pressing the keys individually will not trigger the desired function. Confusion with other Mac startup key combinations, such as Command + R for Recovery Mode, can lead to unintended results.
-
Source Mac Readiness
While the key combination is executed on the iMac designated as the external display, the source Mac also plays a role. The source Mac must be powered on and have its video output active. Connecting the two Macs via the appropriate Thunderbolt cable before powering on the iMac is recommended. This ensures a smooth transition into Target Display Mode once the key combination is pressed.
-
Troubleshooting Key Combination Issues
If Target Display Mode fails to activate, verifying the correct key combination, timing, and cable connection is crucial. Keyboard functionality issues on the iMac can also prevent successful activation. Troubleshooting these factors, including trying a different keyboard or checking keyboard settings, can often resolve activation problems. Systematically addressing potential issues ensures eventual success in entering Target Display Mode.
Mastering the startup key combination is an essential step for leveraging the Target Display Mode feature on a 2017 iMac. Correct execution, combined with a compatible source Mac and the appropriate cable, enables users to seamlessly integrate the iMac into their workflow as a high-resolution external display. Failure to execute this step correctly prevents the iMac from entering Target Display Mode, highlighting the critical role this key combination plays in the overall process.
6. Audio Output Selection
When a 2017 iMac operates in Target Display Mode, audio output selection becomes a critical consideration. The iMac’s internal speakers become available as an audio output option for the source Mac. This allows users to leverage the iMac’s audio capabilities, eliminating the need for separate speakers. However, the source Mac retains control over audio routing. Therefore, users must specifically select the iMac as the audio output device within the source Mac’s sound settings. Failure to select the correct output results in audio continuing to play through the source Mac’s built-in speakers or a previously selected audio device. For example, if a MacBook Pro is connected to a 2017 iMac in Target Display Mode, the user must navigate to the sound settings within macOS on the MacBook Pro and select the iMac as the audio output device.
This functionality extends beyond simple audio playback. Applications leveraging the iMac’s speakers include video conferencing, multimedia presentations, and general audio consumption. The ability to consolidate audio output to the iMac streamlines the workspace and simplifies cable management. However, potential conflicts can arise. If the iMac was previously paired with Bluetooth headphones or other wireless audio devices, these connections may interfere with the source Mac’s ability to utilize the iMac’s speakers. Disconnecting or unpairing these devices before activating Target Display Mode often resolves such conflicts. Furthermore, audio latency, the delay between audio signal transmission and playback, can sometimes occur. This latency is usually minimal but can be noticeable in certain applications. Adjusting audio buffer sizes within specific applications might mitigate this issue. A practical example demonstrating the utility of this audio integration could involve using the iMac’s speakers for a video conference conducted on the source Mac, eliminating the need for separate speakers or headphones.
Understanding audio output selection within the context of Target Display Mode on a 2017 iMac is crucial for a complete and integrated user experience. Correctly configuring audio routing maximizes the utility of this functionality, allowing users to leverage the iMac’s audio capabilities while simplifying their workspace setup. Addressing potential conflicts with pre-existing audio connections and understanding potential latency issues ensures optimal audio performance. This informed approach enhances the overall value proposition of using the 2017 iMac as an external display, transforming it into a comprehensive audiovisual solution for the connected source Mac.
7. Troubleshooting steps
Troubleshooting is an inevitable aspect of utilizing Target Display Mode on a 2017 iMac. Various factors, ranging from hardware inconsistencies to software conflicts, can disrupt the intended functionality. Understanding common issues and their respective solutions is crucial for effectively resolving these problems and ensuring a seamless experience. For instance, if the iMac does not enter Target Display Mode after pressing the requisite key combination, several factors warrant investigation. Cable integrity, proper port connection on both devices, and the source Mac’s video output status are primary areas to examine. A loose or damaged cable, connection to the wrong Thunderbolt port, or a sleeping source Mac can all prevent successful activation. Systematically checking these elements often reveals the root cause and guides the user towards a solution, such as replacing a faulty cable or ensuring the source Mac is awake and outputting a video signal.
Further complications can arise from software configurations. Outdated drivers on the source Mac, incompatible operating system versions, or conflicting software utilities can interfere with Target Display Mode. Verifying driver versions and operating system compatibility, potentially through updates or rollbacks, is a necessary diagnostic step. Similarly, disabling potentially conflicting software, particularly those interacting with display settings or video output, can isolate software-related issues. For example, third-party display management software on the source Mac could interfere with the handoff to Target Display Mode. Temporarily disabling such software allows one to determine if it contributes to the problem. Additionally, firmware updates for both the iMac and the source Mac occasionally address Target Display Mode-specific bugs, further emphasizing the importance of maintaining up-to-date system software.
Effective troubleshooting of Target Display Mode issues relies on a systematic approach. Checking physical connections, verifying software compatibility, and isolating potential conflicts are fundamental steps. Understanding the interplay between hardware and software components within this configuration enables users to pinpoint the source of problems and implement appropriate solutions. This methodical process empowers users to overcome challenges, ensuring consistent and reliable operation of Target Display Mode, thereby maximizing the utility of the 2017 iMac as an external display.
Frequently Asked Questions
This section addresses common queries regarding the use of a mid-2017 21.5-inch or 27-inch iMac in Target Display Mode.
Question 1: Which specific iMac models support Target Display Mode?
Only the 21.5-inch and 27-inch iMac models released in mid-2017 are compatible. Later 2017 models, including the iMac Pro, do not support this functionality. Model identification is crucial for compatibility verification.
Question 2: What type of cable is required for Target Display Mode?
A Thunderbolt 2 cable or a Thunderbolt 3 cable used with a Thunderbolt 2 adapter is necessary. Standard Thunderbolt 3 cables without the adapter will not function. Cable choice also influences the maximum achievable resolution.
Question 3: Can any Mac be used as a source for Target Display Mode?
No. The source Mac must have a compatible Thunderbolt port and operating system. Consulting Apple’s documentation for a list of supported Mac models is recommended.
Question 4: How is Target Display Mode activated on the iMac?
The key combination Command + F2 must be pressed immediately after powering on the iMac. Timing is critical. The source Mac must also be powered on and have an active video output.
Question 5: Can the iMac’s speakers be used for audio output in Target Display Mode?
Yes. The iMac’s speakers become an available audio output option for the source Mac within its sound settings. Selecting the iMac as the output device routes audio through its speakers.
Question 6: What if the iMac does not enter Target Display Mode?
Several factors could contribute to this issue, including cable malfunction, incorrect port connection, incompatible source Mac, or software conflicts. Systematic troubleshooting, starting with cable verification and progressing to software diagnostics, is essential.
Understanding these frequently asked questions provides a foundational understanding of Target Display Mode functionality and facilitates successful implementation. This knowledge equips users to troubleshoot common problems, optimizing the utilization of their mid-2017 iMac as an external display.
This concludes the FAQ section. The following section will delve into more advanced topics, such as optimizing display settings and addressing specific compatibility challenges.
Optimizing Target Display Mode on a 2017 iMac
This section offers practical tips for optimizing the Target Display Mode experience on a mid-2017 21.5-inch or 27-inch iMac, enhancing productivity and streamlining workflows.
Tip 1: Verify Compatibility Beforehand: Confirm the iMac model, source Mac, and cable compatibility. Consulting Apple’s official documentation avoids potential setup frustrations. Using an incompatible configuration leads to unsuccessful Target Display Mode activation.
Tip 2: Optimize Resolution and Refresh Rate: Select the highest resolution supported by the connection and the source Mac. While 5K resolution is achievable with specific configurations, Thunderbolt 2 connections limit resolution to 4K. Understanding these limitations ensures optimal visual clarity.
Tip 3: Prioritize Cable Quality and Length: High-quality Thunderbolt cables minimize signal degradation. Shorter cables generally offer better signal integrity, especially for higher resolutions. Longer cables might necessitate active Thunderbolt cables for maintaining signal strength. Cable quality directly impacts display performance.
Tip 4: Manage Audio Output Settings: Remember to select the iMac as the audio output device within the source Mac’s sound settings to utilize the iMac’s speakers. This consolidates audio output, simplifying workspace organization.
Tip 5: Address Potential Software Conflicts: Disable potentially conflicting software, particularly third-party display management utilities, on the source Mac to isolate and resolve software-related issues impacting Target Display Mode functionality.
Tip 6: Keep Software and Firmware Updated: Maintaining up-to-date software and firmware on both the source Mac and the target iMac ensures optimal compatibility and addresses potential bugs affecting Target Display Mode performance.
Tip 7: Utilize Keyboard Shortcuts for Seamless Navigation: Familiarize yourself with keyboard shortcuts for switching between displays and managing windows within the dual-display setup. This streamlines workflow efficiency.
Tip 8: Consult Apple’s Support Resources: Leverage Apple’s official support documentation and community forums for troubleshooting specific issues and accessing in-depth technical information regarding Target Display Mode.
Adhering to these tips ensures a stable, high-quality Target Display Mode experience, maximizing the 2017 iMac’s utility as a secondary display. Optimized configuration improves productivity and streamlines workflows within a multi-display environment.
This section concludes the practical tips. The following section will provide a concise summary of key takeaways and benefits, culminating in a comprehensive understanding of Target Display Mode on the 2017 iMac.
Target Display Mode 2017 iMac
This exploration of Target Display Mode on the mid-2017 21.5-inch and 27-inch iMac models has detailed crucial aspects of this functionality. Key takeaways include the specific model requirements, the necessity of appropriate Thunderbolt cables, compatibility constraints regarding source Macs, and the importance of correct startup key combinations. Understanding resolution and refresh rate limitations, audio output selection, and potential troubleshooting steps further empowers users to leverage this feature effectively.
Target Display Mode offers significant value by repurposing capable iMacs as high-quality external displays, extending their utility and optimizing workflows. Careful consideration of the technical nuances outlined herein ensures a seamless and productive multi-display experience. This functionality, while specific to these 2017 iMac models, represents a valuable tool for users seeking to maximize their hardware investment within the Apple ecosystem.
