I know it isn't a perfect fix, but I'll give it a go. From my understanding (correct me if I'm wrong) the power on button on the wii remote sends a special signal, because a remote that is not paired will still power it on and off. So either figure out how to make a reciever for said signal (but the wii will turn on every time you turn on the pc). or just build a small 12v relayby Lucidious - Hardware