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Whenever I plug a flash drive into the USB 3.0 port it stops the USB 2 port from working. As I have my mouse connected to the USB2 port this is a problem. The touch pad does still work with the USB 3.0 port in use but the USB 2 port is dead until I remove the flash drive from the USB 3.0 port. The USB 3.0 port works fine all the time. It appears to be that the USB 3.0 port draws so much power that it stops the USB port from working. My laptop is an Acer E3-112 and has just 1 x usb 3 port and 1 x usb 2 port. It is running Windows 8. I would very much appreciate any ideas.