Mac Modular Desktops Troubleshooting Quick Checks
Troubleshooting quick checks for all issues
Try these steps before continuing to issue-specific troubleshooting.
Start up the Mac in safe mode.
Check for and install macOS software and firmware updates. Ensure that the computer's software is up to date before performing further troubleshooting.
Determine whether the computer is in Device Firmware Update (DFU) mode. In this mode, the computer may be unresponsive and can appear to have an issue. For desktops with a status indicator light (SIL), the SIL will be solid amber, or flash amber in an S.O.S. pattern (rapid flashes three times, brief flashes three times, rapid flashes three times), to indicate that the computer is in DFU mode. 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.
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
Input-Output
Adapters for the Thunderbolt 4, Thunderbolt 3, or USB-C port on your Mac
If you can’t connect your Magic Keyboard, Magic Mouse, or Magic Trackpad to your Mac