Wait at least five seconds, and then press the power button to turn on the Mac. Unplug the power cord, wait 15 seconds, and then reattach the cord. If it isn't shutting down, hold the power button for at least 10 seconds to force it to shut down. Click the Apple menu and click "Shutdown" to turn it off completely. Press the "Command-Option-Esc" buttons to shut down applications that aren't responding.Ĭlick the Apple menu and click "Sleep." Wait a few seconds, and then press any key to wake the computer.
Hold the "Command-Option-P-R" keys together before the gray screen appears until you hear the startup sound for the second time.
Shut down the computer if you don't see one of your USB devices in the device list. Restart your computer again, and then reconnect the USB devices.Ĭlick the Apple menu, select "About This Mac," and then click "More Info." Click "USB" to view a list of the USB devices connected to your Mac. Unplug connected USB devices if the ports are still not working.
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