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Some times dust gets into usb port use a little brush to clean or some air or switch the sensor to another port.
Sorry, there was a problem. Please try again later.Hello e27865! I'm not exactly sure what button you pressed on your MK540 Advanced Wireless Keyboard and Mouse Bundle to get that result, but I would double check your keyboard language at the bottom right of your screen to make sure it's right, save up any work you're doing, unplug and reconnect the Unifying Receiver, and if that doesn't fix it, try restating your computer.
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