How to Turn On a Mac Computer
If you're using a Mac laptop, press the Power or Touch ID button at the top-right corner of the keyboard. If you're using a Mac Pro, iMac, or Mac Mini, press the power button on the top or rear of the unit. If your Mac isn't turning on, press and hold the Power button for 10 seconds, release it, and then press it again. Also try checking the cords that plug into the computer and the wall for looseness or damages, and test with another outlet if possible.
Charge your Mac laptop. If your battery is not charged, plug your laptop into a power source now. Some Mac notebooks will automatically power on once plugged into a power source. Open the lid of your laptop. Most newer Mac laptop models will power on automatically once you open the lid. If this doesn't turn your laptop on, skip to the next step. Locate the Power button . The location of this button varies by model. If your Mac's keyboard has a row of physical function keys (F1-F12) running along the top of the keyboard, you'll find the power key at the far-right end of this row. The key has a "Power" icon, which is an open circle that contains a vertical line at its center. If you're using a MacBook with Touch Bar and/or Touch ID (such as some MacBook Pros and MacBook Air models from 2018 and later), the power button is a solid black touch key at the top-right corner of the keyboard. Press the Power button. You may have to hold it for a few moments. Once you see activity on the screen, you can lift your finger from the Power button. A chime will usually sound on a successful power-up. Depending the model, you may be able to power on the laptop by pressing any key on the keyboard. Plug your iMac into a power source. Your iMac must be connected to a functional power outlet to turn on. Locate the Power button . It's a round button that's labeled with the "Power" icon, which is an open circle containing a vertical line, and located on the back of the computer at the bottom-right corner. Push the Power button. You may have to hold it down for a few seconds. A chime will sound on a successful power-up. Plug your Mac Pro into a power source. Your Mac must be connected to a functional power outlet to turn on. Locate the Power button . It's a round button that's labeled with the "Power" icon, which is an open circle containing a vertical line. If you're using a 2019 Mac Pro, it'll be on the top of the tower. On earlier Mac Pros, you'll find the button on the rear side of the tower. Push the Power button. The Mac will power on or wake from Sleep mode. A chime will sound on a successful power-up. Plug your Mac Mini into a power source. Your Mac must be connected to a functional power outlet to turn on. Locate the Power button . It's a round button labeled with the "Power" icon, which is an open circle containing a vertical line. You'll find it on the back of the Mac Mini on the far-left side. Push the Power button. The Mac will power on or wake from Sleep mode. A chime will sound on a successful power-up. 
Charge your Mac laptop. Open the lid of your laptop. Locate the Power button . Press the Power button. Plug your iMac into a power source. Locate the Power button . Push the Power button. Plug your Mac Pro into a power source. Locate the Power button . Push the Power button. Plug your Mac Mini into a power source. Locate the Power button . Push the Power button. 