Hi!
Well, best case scenario: the cable for the LED came loose and you need to put the cable back in the connector to get it working again.
Worst case scenario: The cables are teared OR the LED light is broken.
Please check this great guide to fix it: [guide|3455]
You can buy the whole front face plate with LED board here: https://www.ebay.com/itm/285198290614?itmmeta=01HWSBVWCDBFNNC2R21CASFSMQ&hash=item4267248eb6:g:RHMAAOSwlpNkGzFC&itmprp=enc%3AAQAJAAAAwKfjn2oYUj8WeSlgTvnQUDxNmV48PykEQpSRcJ%2FMH0CTpfaM%2BKUQd48GMjx636clYVezlxE8FYVbyVxy5zBoi3uw%2BNuLTxmX9CIxd3tx%2BwurShXpG%2B1MFZ34vjoPZbmGfEvPW7sWOyYPeK%2FcwD2h5ewuC%2BDztjMg%2FHJG%2Bq11DdgS2slmXeDc5aqKIVT6P%2Br9kk0cg2MdXnuorWUSFx37AiDUtFhpRNo53AkDdrAkE%2Br3zRpmhLe3U2GZG9Vg66KsXg%3D%3D%7Ctkp%3ABk9SR67G76vmYw
Note: What Kenku is saying is correct. The LED light does not affect the Wii Drive at all. So it's your decision if you want to have it repaired or not.