Perform the following steps, as applicable, to troubleshoot USB devices that are not working correctly:
Power: If the USB device operates on battery power, make sure the batteries are correctly seated and are functional. If the USB device operates on external power, make sure all the power connections are secure and the power cord is connected to a power source.
Test the USB connection: Sometimes, simply disconnecting and reconnecting the USB device to the computer can solve the problem:
Disconnect all USB devices from the computer except a USB mouse and keyboard (if in use). This includes hubs, thumb drives, printers, and cameras.
With all USB devices disconnected, do one of the following:
If you have a desktop computer, connect the device that is not working correctly to one of the USB ports on the back of the computer (the ports attached directly to the motherboard).
If you have a notebook computer, connect the device that is not working correctly to a USB port on the notebook. Do not use a USB port replicator (such as a docking station or USB hub).
What happens when the device is connected?
The device works correctly: The problem is most likely related to power or poor overall system performance.
To prevent the USB device from failing in the future: Do not connect too many devices to the computer; wait 5 seconds after connecting a device before using it; use powered hubs to connect other devices; and do not attach USB devices when the system is busy (running slower than normal).
The device does not work: Leave the device connected and continue to the next step.
Installing USB manufacturer software: Some USB devices require manufacturer software to be installed before the USB device will work.
If the USB device came with software, and it was not previously installed, install the software now, following the manufacturer instructions.
After installing manufacturer software, reconnect the USB device that was having problems.
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