7 Mac Startup Options Every OS X User Should Know
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Guest User Sign In. Locate the following keys on the keyboard: Turn on your Mac. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. Hold these keys until the computer restarts and you hear the startup sound for a second time. After resetting NVRAM, you may need to reconfigure settings for speaker volume, screen resolution, startup disk selection, and time zone information. If you are experiencing issues with powering on your computer, sleep, wake, charging your Mac notebook battery, or other power-related symptoms, you might need to reset the SMC instead.
Before resetting the SMC: You should only do an SMC reset after you've tried all other standard troubleshooting. Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to see if the issue still occurs.
Press Command-Option-Escape to force quit any application that command option p r mac pro not responding. Wake the computer after it has gone to sleep. Restart your Mac by choosing Restart from the Apple menu. Shut down your Mac by choosing Shut Down from the Apple menu. If your Mac isn't responding, force the computer to shut down by pressing and holding the power button for 10 seconds.
Note that you'll lose any unsaved work in any open applications. If you're using a Mac notebook and it's having issues related to power or the battery: Unplug the power adapter from your Mac and from the wall power command option p r mac pro for several seconds.
Physically remove and re-insert the battery if it's removable Restart your computer. If the issue still isn't resolved after following these steps, you might need to reset the SMC. On Mac notebooks with non-removable battery Mac notebook computers that have a battery you should not remove include: To reset the SMC: Shut down the computer. On the built-in keyboard, press the left side Shift-Control-Option keys and the power button command option p r mac pro the same time.
Release all the keys and the power button at the same time. Press the power button to turn on the computer. Disconnect the MagSafe power adapter from the computer if it's connected.
Press and hold the power button for five seconds. Release the power button. Reconnect the battery and MagSafe power adapter. Unplug the power cord. Attach the power cord. Wait five seconds, then press the power button to turn on the computer. For Intel-based Xserve computers that are not responding, you can shut down locally or by using remote commands. You can also shut down by pressing and holding the power button for five seconds.
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