When the Wii's power light is yellow, it means that the system is off (in stanby mode) but will receive data over WiiConnect24. The console will receive messages while it is in this mode and will turn the disc tray light on if it receives any.
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its on stand-by
If you mean the green power light, perhaps the yellow/red standby light blew out? If you're referring to the blue light in the disc tray, you can turn this off and on in your Wii settings. >Wii Settings >second page> WiiConnect24 >Slot Illumination Bright, Dim or Off
If you mean the Thunder Stone, go to the New Mauville Power Plant.
The yellow light is the WiFi signal, the orange is the console Charging and the blue/red light is how much battery is being used
It depends on what you mean. If the light is flashing yellow with green in between it just means that your A/V (video cable) isn't connected properly. So just check and see if the cable is connected or not. If the Xbox is just plain yellow then it means it is overheating and you should shut it off. Now if it was red that means there is a hardware failure and you would need to get it fixed. So be glad it's just yellow. :) Hope this helped you.