Fixed: How to fix iMac Boot Failure issues

Solutions

If your iMac is experiencing boot failure, don’t panic. This issue can be caused by software glitches, hardware problems, or power-related issues. Fortunately, there are several troubleshooting steps you can take to get your iMac up and running again. Follow these solutions to diagnose and fix the problem efficiently.

Step 1: Check Power and Connections

• Verify that the power cable is securely plugged into both the iMac and the power outlet.
• If you are using a power strip or surge protector, try plugging the iMac directly into a wall outlet.
• If the power cable is damaged, replace it with a known working one.
• If using an external display, ensure it is powered on and properly connected.

Step 2: Force Restart the iMac

• Press and hold the Power button for at least 10 seconds until the iMac shuts down.
• Wait a few seconds, then press the Power button again to restart it.
• If the screen remains black or the Apple logo does not appear, move to the next step.

Step 3: Check for Display Issues

• Increase the brightness using the F2 key on the keyboard.
• If using an external display, confirm it is working by connecting it to another computer.
• Try another video cable or adapter if you are using an external monitor.
• If the display remains black, continue with the next steps.

Step 4: Boot into Safe Mode

• Turn off the iMac completely.
• Turn it back on and immediately press and hold the Shift key.
• Release the Shift key when you see the login screen.
• If the iMac boots successfully in Safe Mode:
• Restart it normally and check if the issue persists.
• If the problem returns, uninstall recently installed software or updates that might be causing conflicts.
• Run Disk Utility to check for errors (explained in Step 7).

Step 5: Reset NVRAM/PRAM

• Turn off the iMac.
• Turn it on and immediately press and hold Option (⌥) + Command (⌘) + P + R.
• Keep holding the keys for about 20 seconds.
• Release the keys when you hear the startup chime or see the Apple logo appear twice.

Step 6: Reset the System Management Controller (SMC)

• Shut down the iMac.
• Unplug the power cable and wait at least 15 seconds.
• Plug the power cable back in, wait a few seconds, and press the Power button to turn it on.
• If the iMac does not boot, continue to the next step.

These troubleshooting steps should help resolve iMac boot failure issues. If the problem persists, seek professional support to ensure a proper fix.