To turn your Mac mini on, you have to locate the power button. When you’re looking at the front of your Mac mini, the power button is located on the right-hand backside of your computer. If you’re looking at your Mac mini from the back, you’ll see the power button on the left side of the computer’s ports.
Now, all that’s left to do is press the power button and wait for the boot-up chime. If your Mac mini is not turning on, please check if your power cable is connected to the power supply.