If you're experiencing difficulties switching between macOS and Windows on your Mac Mini after installing Windows 10 using Boot Camp, there are a few steps you can try to troubleshoot the issue:
1. Reset NVRAM/PRAM: Start by resetting the NVRAM (non-volatile random-access memory) or PRAM (Parameter RAM) on your Mac Mini. To do this, restart your computer and hold down the Command + Option + P + R keys simultaneously before the gray startup screen appears. Keep holding the keys until your Mac Mini restarts again and you hear the startup chime twice. This process resets certain settings, including the startup disk selection.
2. Check Boot Camp Control Panel (Windows): Once you're logged into Windows, open the Boot Camp Control Panel. You can do this by searching for "Boot Camp" in the Start Menu or by navigating to the Control Panel and looking for the Boot Camp icon. In the control panel, make sure the macOS partition is selected as the default startup disk.
3. Use Startup Disk preferences (macOS): If you're able to access macOS, you can also try changing the startup disk selection using the Startup Disk preferences. Go to the Apple menu, select "System Preferences," then choose "Startup Disk." From there, select the macOS partition as the default startup disk and restart your Mac Mini.
4. Check your keyboard: It's possible that the issue lies with the keyboard or the keys you're using to access the boot menu. Try using a different keyboard or ensure that the keys you're pressing during startup are functioning properly.
5. Update macOS and Windows: Make sure both macOS and Windows 10 Pro are up to date with the latest software updates. This can help resolve compatibility issues and improve overall system stability.
If none of these steps resolve the issue, it might be helpful to reach out to Apple Support or consult with a technical expert who can provide more specialized assistance based on your specific hardware configuration. To contact Apple Support directly just select the "Support" link on the lower left-hand side of this forum's web page.