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How to fix your Mac not detecting second (external) monitor issue [Guide]

Lisa Kudrow

Apr 03, 2025 am 09:26 AM

Connecting your MacBook to an external display expands your workspace, boosting productivity for complex tasks. This guide helps you troubleshoot common connection problems.

How to fix your Mac not detecting second (external) monitor issue [Guide]

Why Your Mac Might Not Detect a Second Monitor & Solutions:

Problem	Solution
Cable/Connector Issues	Inspect cables and connectors for damage. Test with different Mac/monitor combinations.
Mac Software Problem	Update macOS (System Settings > General > Software Update) and restart your Mac.
Incorrect Display Settings	Adjust resolution: System Settings > Displays > Resolution > Scaled; choose a compatible option.
Monitor Connection Limits	Check Apple's tech specs to confirm your Mac supports multiple displays. Use DisplayBuddy for advanced control.

How to fix your Mac not detecting second (external) monitor issue [Guide]

Take Control with DisplayBuddy: Manage brightness, resolution, and more directly from your menu bar. Available on Setapp.

Troubleshooting Steps:

Step 1: Verify Physical Connection: Check cables for damage, dust, or debris in ports. Test cables with a different setup. Some adapters need specific software; consult your manufacturer's instructions.

Step 2: Prepare Your Mac: Restart your Mac. Check for macOS updates (System Settings > General > Software Update).

Step 3: Adjust Display Settings: Set the appropriate resolution (System Settings > Displays > Resolution > Scaled). Increase brightness if needed. Confirm your Mac supports multiple monitors (Apple menu > System Settings > Help > [your Mac’s name] Specifications > Display/Video Support).

Step 4: Simplify Multi-Monitor Management (Optional): Use DisplayBuddy for easy control of external display settings from your menu bar. For enhanced brightness, consider Vivid. Both are available on Setapp.

How to fix your Mac not detecting second (external) monitor issue [Guide]

If problems persist after these steps, professional service may be necessary. Setapp offers a 7-day free trial to explore DisplayBuddy and Vivid.

Frequently Asked Questions:

Why doesn't my Mac recognize my second monitor? Possible causes include faulty connections, outdated macOS, or incorrect display settings. Check compatibility via Apple menu > System Settings > Help > [your Mac’s name] Specifications > Display/Video Support. DisplayBuddy can assist with troubleshooting.
How do I enable dual monitors? Connect the monitor, go to System Settings > Displays, configure settings, and choose "Extended Display" or "Mirror Displays." DisplayBuddy simplifies this process.
How do I make my Mac treat two screens as one? Ensure "Mirror Displays" is not selected in System Settings > Displays.
Why won't my Mac connect to my monitor via HDMI? Test the HDMI cable, check monitor input settings, update macOS, and restart your Mac.

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