Open System Profiler (from the Apple menu, choose About This Mac, then click More Info) and then click either USB or FireWire.
If the device is working now, there may be a software conflict between the device and something in your original user account.
If you don't have another computer available, log in to another user account on your Mac (or create a new user account and log in to it), and test the device again. If you have another Mac available, try connecting your device to that other computer to see if it works. If you're using a particular application that uses the device in question (for example, you're using Image Capture with a USB scanner), try quitting the application and then opening it again. When you find the device that causes the issue, contact the manufacturer for assistance (check both manufacturers' websites for software updates and additional information). Connect your other devices to your Mac, one by one, making sure to test that each device works before making another connection. If you do have a conflict, you can determine which devices are affected. If your device works now, there may be a conflict between that device and one of your other USB or FireWire devices. Then, connect the device in question directly to your computer. If it does, you should replace the problematic cable.ĭisconnect all USB or FireWire devices (including hubs and extension cables) except for your Apple keyboard and mouse. If you have another known-good cable, try swapping the cable to see if that works. Some devices need to draw power from a USB or FireWire port to work if you connect a device to a non-powered hub (one that isn't plugged in to a power source) or to a low-power port (such as the one on your USB keyboard), it may not work.
If you connected your device to a USB or FireWire hub or to a port on another USB or FireWire device that's connected to your Mac (known as daisy chaining), connect your device directly to a port on your computer. I would use the troubleshooting from the following article to help you get that resolved, named:Ĭonnect your device to a different USB or FireWire port on your Mac. For Magic Keyboard with Touch ID, turn your keyboard off and on, then connect your keyboard to your Mac with the USB to Lightning cable. After you turn Magic Keyboard off then on, Touch ID may be unavailable for up to 10 seconds.It sounds like you are unable to use your keyboard, as it doesn't seem to respond to anything when you are logged into your account even after resetting the SMC, but other devices work to the same usb port.Choose Apple menu > System Preferences, click Touch ID, then make sure that "Unlocking your Mac" or "iTunes Store, App Store & Apple Books" is on, and that you've added one or more fingerprints.Click Login Options, then make sure that Automatic login is off.