Why isnt the blue slot light working on my wii at all?

so when i turn on my wii, the blue light doesent light up at all but the wii turns on though, even when i insert a game or eject a game no blue light, on settings the blue light is turned on and its not working, my wii works but the blue light doesent 

Does anybody know how to fix it 

Or just say a link for replacement parts