An unresponsive Mac Mini when you try to power it on may be caused by loose wiring that is preventing power from reaching the computer. If after trying the basic troubleshooting steps of ensuring all cables are secure, you may need to proceed with resetting the computer's Power Management Unit (PMU) or System Management Controller (SMC), according to the official Apple support site. Whereas the PMU manages your computer's ability to start up after being set to sleep mode, the SMC controls the Intel-based Mac Mini's fans, lights, power and system performance. Resetting the PMU or SMC on your Mac Mini should be reserved as the last step to correct power issues.
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Remove all USB cables from the Mac Mini, including the power cable.
Allow 10 seconds to pass, and simultaneously insert the power cord while holding down the power button on the Mac Mini. The power button is located on the back of the computer.
Release the power button, then press the power button again to turn on the computer. Plug in the cables that connect the keyboard and monitor to the computer to test if your Mac Mini starts up normally. According to Apple, your Mac Mini's date and time will be reset in the process and must be re-synced through the Date and Time preferences in your System Preferences.
Disconnect the power cable from the power port on the back of the Mac Mini, and hold the power button for five seconds.
Remove your finger from the power button, and plug the power cable back into the power port on the back of the Mac Mini. Plug the other end of the power cable into a working electrical socket.
Plug the cable that connects the monitor to the Mac Mini into the back of the computer, and plug any other USB cables including ones for the keyboard and mouse into the USB ports on the Mac Mini. Press the power button to turn the Mac Mini on, which will run the fan inside of the computer.
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