If present, make sure USB is enabled or set to legacy and is not disabled in CMOS setup. With older computers (2010 and earlier), it may be necessary to enable USB in CMOS. After all devices have had power management disabled, close Device Manager, restart the computer, and try the USB devices again.Repeat the steps above for all USB Root Hub and USB Root Hub (USB 3.0) devices listed in Device Manager.In the Power Management tab, make sure the box labeled Allow the computer to turn off this device to save power is unchecked.In the USB Root Hub Properties, click the Power Management tab.

Double-click Universal Serial Bus controllers to expand and show all USB devices.To verify power management is not causing your problem, we suggest disabling it by following the steps below. With some USB devices, the USB power management options can cause problems. If you're using a USB hub, disconnect from the hub and connect directly to USB ports on the back or side of the computer. Make sure you're using the cables that came with the USB device. These cables differ by shielding, and plugging a high-speed device into a low-speed cable can cause signal distortion over long distances. There are two available USB cables: high and low speed. After this is done, insert the battery back into the laptop, reconnect the power cable, and turn the computer back on. Wait five minutes to perform a hard reset.Disconnect the power cable and removed the battery.If the steps above have not helped and you have a laptop with a removable battery, follow the steps below. Finally, plug in your power cable again.Once back in Windows plug in your USB devices.Leaving all the cables disconnected, restart the computer.Unplug the USB devices and power cable from the laptop.To verify this is not the problem, follow the steps below. In some situations, when a laptop switches from battery to power cord, how the power supply delivers power to the USB ports may stop working. Finally, make sure all USB hubs are enabled and that no USB devices are disabled.Īdditional information about Device Manager and how to troubleshoot conflicts is on our Device Manager page. Next, verify that no other devices, including your USB device, is not encountering any conflicts indicated by a yellow exclamation mark. Verify that the USB is present in Device Manager and that the root hub is not encountering an IRQ (interrupt request) or DMA (direct memory access) conflict. If the USB device works on another computer, you know it is a problem with the computer and not the device. Verify the device works properly by connecting it to another USB port or another computer. There are situations when unplugging and plugging in a USB device can cause problems of detecting new USB devices. Restart the computerīefore following any of the steps below, we recommend restarting the computer. If a USB port on your Windows computer is not working correctly, including not reading data from a USB flash drive, the following steps might help you fix the problem.

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