Make sure that the device is turned on, its battery is sufficiently charged and that it is not in standby mode.
Make sure that the device is at your computer wireless range, generally between 1.8 and 2.7 metres. If you are not sure that the device is within range, move the computer or place the device and the computer in the same room.
Check that no other device does interfere with wireless device, such as a microwave, cordless phones or other wireless devices.
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