Make sure that the device is connected directly to the computer, and that any hubs or extension cables are disconnected. If you have many devices connected to your Mac: Disconnect all USB devices except the device you’re testing, an Apple keyboard, and an Apple mouse. You might need to disconnect and reconnect the other device as well, if it has stopped responding. If the device doesn’t have a power cord and is plugged into another USB device that doesn’t have a power cord: Try plugging the device directly into your computer’s USB port or into a USB device that does have a power cord. Connect USB 3.0 SuperSpeed devices to a USB 3.0 SuperSpeed HUB, USB 2.0 Hi-Speed devices to a USB 2.0 Hi-Speed hub, and so on. Visit the manufacturer’s website for any updates.Ĭheck the USB hub: If the device is connected to a USB hub, make sure the device and the hub are the same speed. See Find out how to service or repair your Mac.Ĭheck for missing software: Make sure you installed the latest software for your device. If you still can’t use a device with the port, your computer may need to be serviced.

Wait about a minute, then plug it back into the power outlet and start up your computer. If you can’t use this device, shut down the computer and unplug it from the power outlet. If you can use the device after switching ports, connect another device to the first port. If you still can’t use the device, contact the manufacturer for more information. If your computer has more than one USB port, switch the device’s cable to another port. Get started with accessibility featuresĬheck the power, port, and cable connections: Make sure the USB device is turned on and its cables are properly connected.Use Sign in with Apple for apps and websites.Watch and listen together with SharePlay.Share and collaborate on files and folders.Sync music, books, and more between devices.Make and receive phone calls on your Mac.Use one keyboard and mouse to control Mac and iPad.Use Live Text to interact with text in a photo.Make it easier to see what’s on the screen.Install and reinstall apps from the App Store.

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