Troubleshooting HDMI Output Issue After Updating to Sonoma 14.3 on External SSD (MBP Mid 2012)

Introduction:

• Explain the issue of losing HDMI output after updating to Sonoma 14.3 on an external SSD due to a broken internal SSD.
• Assure users that the issue can likely be resolved with some troubleshooting steps.

Check Hardware Connections:

• Ensure that the HDMI cable is securely connected to both the MacBook Pro and the external display.
• Verify that the external display is powered on and set to the correct input source.

Reset NVRAM and SMC:

• Instruct users to reset the Non-Volatile Random-Access Memory (NVRAM) and System Management Controller (SMC) on their MacBook Pro.
• Provide step-by-step instructions on how to perform these resets.

Verify System Preferences:

• Guide users to check the Display settings in System Preferences to ensure that the external display is detected and configured correctly.
• Verify that the display resolution and refresh rate are set appropriately.

Check for macOS Updates:

• Advise users to check for any available macOS updates that may include fixes or patches for HDMI output issues.
• Instruct users on how to check for updates using the Software Update feature in System Preferences.

Verify Graphics Drivers:

• Ensure that the graphics drivers for the AMD GPU are up to date and compatible with Sonoma 14.3.
• Provide guidance on how to check for and update graphics drivers using the System Information app.

Test with Different HDMI Cable or Adapter:

• Suggest testing the HDMI output with a different HDMI cable or adapter to rule out any potential issues with the current cable or adapter.
• If possible, try connecting the MacBook Pro to a different external display to see if the issue persists.

Check for Physical Damage:

• Inspect the HDMI port on the MacBook Pro for any physical damage or debris that may be obstructing the connection.
• If any damage is found, recommend seeking professional assistance for repair or replacement of the HDMI port.

Contact Apple Support:

• If the issue persists after trying the above steps, advise users to contact Apple Support for further assistance.
• Provide information on how to schedule an appointment at an Apple Store or contact Apple Support online or by phone.

Conclusion:

• Summarize the troubleshooting steps provided and encourage users to follow them systematically to resolve the HDMI output issue.
• Reiterate that while the issue may be frustrating, it can likely be resolved with patience and persistence.