. Your computer's fans run at high speed, even though it isn't under heavy usage and is properly ventilated. The keyboard backlight behaves incorrectly. The status indicator light, if present, behaves incorrectly. Battery indicator lights, if present, behave incorrectly on Mac notebooks with a non-removable battery.

The display backlight doesn't respond correctly to ambient light changes. Your Mac doesn't respond when you press the power button. Your Mac notebook doesn't respond properly when you close or open the lid. Your Mac sleeps or shuts down unexpectedly and you can't turn it back on. The battery doesn't charge properly. Your MacBook or MacBook Pro doesn't charge through its built-in USB-C port.

Your MacBook or MacBook Pro doesn't recognize external devices that are connected to its built-in USB-C port. The MagSafe power adapter LED, if present, doesn't indicate the correct charging activity. Your Mac performs unusually slowly, even though its CPU isn't under an abnormally heavy load. A Mac that supports doesn't switch into or out of target display mode as expected, or it switches into or out of target display mode at unexpected times.

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The illumination around the doesn't turn on when you move the computer. Try each of these steps in this order before you reset the SMC. Test the issue after each step to see if the issue still occurs. If your Mac isn't responding, press and hold the power button until it shuts down. You'll lose unsaved work in any open applications.

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Then press the power button again to turn on your Mac. Press Command-Option.-Escape to force quit any application that's not responding. Put your Mac to sleep by choosing Apple () menu Sleep. Wake the computer after it's gone to sleep. Restart your Mac by choosing Apple menu Restart.

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Shut down your Mac by choosing Apple menu Shut Down, then press the power button again to turn on your Mac. If you're using a Mac notebook that's having power or battery issues, follow these steps:. Unplug the power adapter from your Mac and the electrical outlet for several seconds, then plug it back in. Choose Apple menu Shut Down.

After your Mac shuts down, remove and re-insert the battery if it's removable. Press the power button again to turn on your Mac. If the issue still isn't resolved, you might need to reset the SMC using the steps below.

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On some keyboards, the Option key is also labeled Alt. Try this first:. Choose Apple menu Shut Down. After your Mac shuts down, press and hold its power button for 10 seconds. Sony dcr-pc9 driver for mac. Release the power button, then wait a few seconds.

Press the power button again to turn on your Mac. If that doesn't resolve the issue, follow these steps:. Choose Apple menu Shut Down. After your Mac shuts down, press and hold the right Shift key, the left Option key, and the left Control key for 7 seconds. Then keep holding those keys while you press and hold the power button for another 7 seconds.

Release all three keys and the power button, then wait a few seconds. Press the power button again to turn on your Mac.