iMac Troubleshooting Quick Checks

Troubleshooting quick checks for all issues

Try these steps before continuing to issue-specific troubleshooting.

1. Shut down or restart your Mac.

2. Start up the Mac in safe mode.

3. Check for macOS software updates. Then install macOS software and firmware updates. Ensure that the computer's software is up to date before performing further troubleshooting.

4. Determine if the computer is in device firmware update (DFU) mode. In this mode, the computer may be unresponsive and can appear to have an issue. To exit DFU mode, press and hold the power button for 10 seconds to attempt to shut down the computer. Then press the power button again to attempt to turn on the computer. If the computer turns on, it was in DFU mode and has power.

5. Find the appropriate section below and read the linked articles to help resolve your issue.

More resources

Read these support articles before continuing to issue-specific troubleshooting.

General

• Identify your iMac model

• Take a tour: iMac

• How to clean your Apple products

Input/output

• Identify the ports on your Mac

• About the video ports on Mac

• About the Thunderbolt ports on Mac

• Adapters for the Thunderbolt 4, Thunderbolt 3, or USB-C port on your Mac

• About the Apple Thunderbolt 3 (USB-C) Cable

• If you can't connect your Magic Keyboard, Magic Mouse, or Magic Trackpad to your Mac

Power and startup

• If your Mac doesn’t turn on

• If your Mac doesn't start up all the way

• If you can't start up from macOS Recovery

Sound

• About the audio ports on Mac

• If you can’t hear sound from your Mac speakers

Wi-Fi and Bluetooth

• Resolve Wi-Fi and Bluetooth issues caused by wireless interference