By far the most common issue. The IR Emitter bumped off or not placed in the correct spot.
Cable boxes, media / bluray players, game systems all have different places where the component receives IR. Best practice to reaffix the emitter is this: in one hand, hold the universal remote and press a button that you know has worked. Then slowly move the IR emitter over the front of the component until the device reacts. Use a hot glue gun or a piece of tape to reaffix the emitter to its appropriate place.
Network and Wifi
The second most common issue is with the network. Please see Network Troubleshooting
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