Mac mini won't wake from sleep

Test the following Energy and Lock Screen settings:

Turn On "Prevent automatic sleeping when display is off"

Set "Turn display off when inactive" to 5 or 10 minutes

Leave the Mac Mini On and only allow the display(s) to turn Off

Do not manually Sleep from the Apple Drop Down menu

Shut Down the Mac when away for a day or more

The Mac mini uses very little power idling with the display(s) off during times of none usage.

If you come and go a lot during the day, then just leave it idling between visits.

Then decide if you want to leave it on or shutdown over-night.

Running macOS Tahoe implies you have an Apple Silicon Mini.

See if the following Apple article may apply:

Mac mini Service Program for No Power Issue - Apple Support

FYI, here is an Apple article showing the publicly acknowledged free repair programs available....keep in mind Apple will sometimes have some secret repair programs as well.

Apple Service Programs - Apple Support

What is the exact model of your Mini? You can get this information by clicking the Apple menu and selecting "About This Mac".

Are any external devices connected to the computer when this occurs? If so, then try disconnecting the external devices before putting the system to sleep to see if that makes any difference.

You may want to run the third party app EtreCheck and posting the complete report so we can examine it for possible clues.

How to use the Add Text Feature When Posting an EtreCheck Report - Apple Community

Edit…

“Mac mini won't wake from sleep: […]Is this because of some setting I haven't got wrong? Or is it an OS problem? Or is the Mac faulty? I have Tahoe 26.6.2 on a Mac mini.“

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Mac Powering Off Intermittently:

I. Update or Upgrade the macOS:

So, when did this all begin? Was it after an update installation? If so, it might be a bug in the update. So, update your macOS to the latest-compatible version (macOS 26.7 or macOS 27) IMPORTANT: Be certain you create a Time Machine Backup of your Mac both prior to and after installing updates or any other software installations. That way, you can have something to restore your Mac from, should anything go wrong afterwards.

II. Troubleshooting Mac Power:

A. Black Mac Screen:

Go Here: If your Mac doesn't Turn On or Start Up - Apple Support

Using External Devices: Try Resetting the SMC and NVRAM, but this time, using an external keyboard. Connect an external monitor and see if you get an output.

B. Mac Power Issues:

Try a New Charger:

If it is currently charging from a charger, then use a new charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the right power adapter and cable for your Mac notebook - Apple Support

C. A Few Links to Refer to Power:

• If your Mac doesn't Turn On - Apple Support

• How to Turn your Mac On or Off - Apple Support

• About Mac Notebook Batteries - Apple Support

• Charge the MacBook Pro Battery - Apple Support

• If your Mac Battery won't Charge - Apple Support

MS1234 wrote:

Thanks for quick reply. It seems my Mac doesn't qualify for the Mac mini Service Programme.

It was a long shot since I know that repair program was very limited. Plus your iMac didn't seem to have the power on issue exactly, just a wake from sleep issue.

MS1234 wrote:

Thanks for quick reply. Advice followed!

You're welcome. If you have time, come back after a couple of days with a progress report.

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