You cannot turn on the blue wii light it turns on by itself when there is a new letter in your wii mailbox.
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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
Turn on the Wii and open the case on the back of the 2nd Wii remote and you will find a red button that says sync. Then open the little door on the front of your Wii,and you will find another red button. Press the red sync button on both the Wii and Wii remote at the same time. After all that, the 2nd light on the 2nd Wii remote should light up blue
It means it is charging.
My Wii works fine. If your Wii won't turn on and there's no power light then it's probably not plugged in properly or the power is out. If the power light is green then the Wii is already on. If the power light is red or yellow, try unplugging it and then plugging it back in.
The light on the dual charger will turn green. When it is charging the light is red.