How to Turn an Old iMac into a 2nd Monitor - Cheaply!

by Andrew Sweeney

📚 Main Topics

  1. Introduction to Using an Old iMac as a Monitor

    • Exploring options to repurpose a 2006 iMac as a second monitor for a new MacBook.
  2. Method 1: Using Duet Display

    • InstallationDownload and install the Duet Display app on both the old iMac and the new MacBook.
    • Network ConnectionEnsure both devices are connected to the same network.
    • SetupExtend the desktop from the MacBook to the iMac.
    • Quality ImprovementFor better performance, connect the devices using a Thunderbolt cable instead of Wi-Fi.
  3. Requirements for Duet Display

    • The old iMac must run at least macOS 10.13 (High Sierra).
    • Necessary hardware includes a Thunderbolt port and a compatible Thunderbolt cable.
  4. Method 2: Using Luna Display

    • InstallationDownload the Luna Display app on the new Mac and the Luna secondary app on the old iMac.
    • HardwareUse a dongle for connection.
    • SetupLaunch the apps on both machines to establish a connection.
    • Performance TipFor optimal performance, connect both computers via Ethernet.
  5. Compatibility of Luna Display

    • Works with older Mac versions down to macOS 10.11 (El Capitan).
    • Allows the use of an iPad as a second display as well.

✨ Takeaways

  • Repurposing an old iMac as a second monitor can enhance productivity without the need for purchasing new hardware.
  • Both Duet Display and Luna Display offer viable solutions, with different compatibility and performance features.
  • Wired connections (Thunderbolt or Ethernet) provide better reliability and quality compared to wireless connections.

🧠 Lessons

  • Before starting, check the macOS version on the old iMac to ensure compatibility with the chosen app.
  • Investing in the right cables and adapters can significantly improve the performance of using an old Mac as a monitor.
  • Exploring software options can provide flexibility in how you set up your workspace, allowing for creative use of existing technology.

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