Experiencing display flickering, black screens, or problems with external monitors? Here's how to troubleshoot common display issues.

Symptoms

  • Screen flickers, shows artefacts, or goes black intermittently

  • External monitor not detected or showing wrong resolution

  • Display colours appear wrong

Step-by-Step Resolution

1. Check Cables and Ports

  1. For external displays, reseat HDMI/DisplayPort/USB-C cables firmly

  2. If possible, try another cable

  3. Test with a different port on your Mac

2. Adjust Display Settings

  1. Go to System Settings > Displays

  2. Ensure the correct display is selected

  3. Set resolution appropriately ("Default for display" is usually best)

  4. For external monitors, check "Optimize for" settings

3. Test with Another Monitor

  1. If available, connect your Mac to a different external display

  2. This helps determine if the issue is with your Mac or the monitor itself

4. Update macOS and Reset NVRAM/PRAM

  1. Apply all macOS updates via System Settings > General > Software Update

  2. Reset NVRAM/PRAM (Intel Macs):

    • Shut down

    • Turn on and hold Option+Command+P+R for 20 seconds

    • Release and restart

5. Check for Display Adapter Issues

  1. If using a USB-C to HDMI adapter, ensure it supports the resolution you need

  2. Try a different adapter if available

  3. Some adapters require firmware updates

Display issues persist? The graphics subsystem or physical display may be failing. Our team can provide accurate diagnosis and repair recommendations.

Book a Support Session