If this is the case, the computer may need to be serviced.ĭoes the affected device have a power cord? If it does, try unplugging and replugging it. Sometimes one port on the computer will stop functioning, but others will still work.
Also test each port using a good, working USB device. Not all USB ports in the computer are workingĬheck the device in all the USB ports on the computer. The device may need more power than the port provides.Ħ. If it works there, the issue is with the device to which it had been previously connected. If you have the device plugged into a USB hub or into your keyboard, plug it directly into one of the USB ports on the computer.
With each of the following items, check the System Profiler window (press Command-R to refresh the list) to see if the device appears. In this event, continue on to the next item on this list. If the device doesn't show up in System Profiler, the issue is more likely to be hardware-either the device or the USB port isn't working properly. Your best solution is to try updating the drivers, creating a new user, or reinstalling the system software. If the device shows up in System Profiler, even if the device doesn't work, the issue is usually due to software. It may not identify them correctly by name, but it should have the right number of devices listed. From the Contents column on the left, under the Hardware header, select USB the panel to the right will show all the USB devices that the computer recognizes. Open System Profiler from the Utilities folder, which is inside the Applications folder. If it works again, there is an incompatibility with the device and whatever you added. Did you recently add another new device? Install a new program? Try reverting the computer to the way it was before the device stopped working. Is it a new device, or a device that stopped working?Īsk yourself, is this a new device that never worked, or is it a device that you've had for a while that suddenly stopped working? If it used to work, think about what changed just before the device stopped working. If you find this to be the case, contact the manufacturer for assistance.ģ. Sometimes two devices will have a conflict and won't work together. Then start plugging in USB devices one at a time, testing each one to make sure they all work before adding the next. Unplugging other devices that's plugged into the USB portsįor troubleshooting purposes, unplug all USB accessories from the computer. Make sure that the connection is secure.Ģ. Unplug the affected device from the USB port and then plug it back in. Make sure connection to the USB port is secure
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