- Click the Apple logo and click "Restart" to reboot your Mac laptop. A reboot is a simple way of solving common hardware problems.
- Unplug connected USB devices if the ports are still not working. Restart your computer again, and then reconnect the USB devices.
- Click 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.
- Shut down the computer if you don't see one of your USB devices in the device list. Turn the computer back on. Hold the "Command-Option-P-R" keys together before the gray screen appears until you hear the startup sound for the second time. Release the keys.
- Press the "Command-Option-Esc" buttons to shut down applications that aren't responding.
- Click the Apple menu and click "Sleep." Wait a few seconds, and then press any key to wake the computer.
- Restart your computer. Click the Apple menu and click "Shutdown" to turn it off completely. If it isn't shutting down, hold the power button for at least 10 seconds to force it to shut down.
- Unplug the power cord, wait 15 seconds, and then reattach the cord. Wait at least five seconds, and then press the power button to turn on the Mac.
Tip: If the USB ports are still not working, your Mac may be experiencing deeper hardware issues, so contact Apple for additional troubleshooting and possible repair.
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