Wait five seconds, then press the "Power" button. Wait fifteen seconds, then plug it back in. Desktop - Shut down the iMac and unplug the power cord.Release the "Power" button, reinsert the battery, and plug in your computer to a power source. Unplug the power adapter and remove the battery, then hold down the "Power" button for five seconds. Laptop with removable battery - Shut down your computer.Using the left side of the built-in keyboard, hold down ⇧ Shift + Control + ⌥ Option while pressing the "Power" button, then release all keys, and finally press the "Power" button again.
Laptop with non-removable battery - Shut down your computer and plug it into a power source.If none of the steps above solved your problem, reset the SMC: X Research source If you still see a blank screen after about 20 seconds, it's time to move on. Press Shift-Control-Option on the left side of the built-in keyboard, then press the power. On an older Intel-chipped MacBook Pro, press and hold the power button for about 10 seconds, then press and release the power button and immediately press and hold Command + R until you see an Apple logo or other image. An issue with the SMC can prevent your power button from working properly, or cause general slowdowns. Choose Apple menu > Shut Down and wait for your Mac to shut down. The SMC, or System Management Controller, handles many of the physical components on your Mac.
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