MAC Apple Hardware Test

Whats the error message?

If you have firmware password enabled you may need to disable it in system recovery.

https://support.apple.com/en-us/HT201257

• Some Mac computers that shipped with OS X Lion v10.7 or later will start up from AHT over the Internet if your startup disk doesn't contain AHT, or if you hold down Option-D at startup. This requires an Internet connection over Ethernet or Wi-Fi.
• If you're using OS X Lion v10.7 or earlier and you can't get AHT to start, see if you have an OS X installation disc named “Applications Install Disc 2.” Insert the disc in your internal optical drive or external Apple SuperDrive before following the steps above. Or, if you're using a MacBook Air (Late 2010), plug the MacBook Air Software Reinstall thumb drive into your USB port instead.

I've only used the free version once or twice so I'm not sure since the free version does not do automatic scanning (at least after the trial period).

If you have the paid version, then according to this forum thread you just need to turn off the automatic check for updates and delete scheduled scans.

https://forums.malwarebytes.com/topic/235595-run-on-demand-scans-only-with-no-processes-running-otherwise/

oscara7 wrote:

Error: ox8000000000000003

cannot load 'EFI/drivers/test support.CFI

Status: 0x00000003

Apple broke online diagnostics with the newer firmware updates and has not bothered to fix it yet. You can provide feedback to Apple here:

https://www.apple.com/feedback/

What problem are you having with the Mini that you want to check the hardware?

Run EtreCheck and post the report here using the "Additional Text" icon which looks like a piece of paper.

You may also want to run DriveDX to check the health of the hard drive. Even if the drive shows as healthy, post the report here as it may contain clues.

The hard drive looks good.

Uninstall the App Cleaner app as it is not needed on a Mac since those types of apps tend to cause more problems than they solve. Plus those apps tend to slow down the system.

MalwareBytes is fine, but if it was my system I would not have it running all the time, but the choice here is yours.