To turn your Mac Pro on, you have to locate the power button. Depending on your Mac Pro generation, the power button may be in a different position. If you have the latest Mac Pro 2019, the power button is located on the top of the computer tower, between the handles. If you’ve got a black Mac Pro from 2013, the power button is above the power cable on the back. If you have an older Mac Pro the power button is located in the front of the computer, just above the USB ports.
Now, all that’s left to do is press the power button and wait for the boot-up chime. If your Mac Pro is not turning on, please check if your power cable is connected to the power supply.