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.
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.
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