Why Is My Ethernet Adapter Not Working. Restart your router and wait until you see the lights go on where the ethernet cable plugs in. Then if there are light on your adapter they should also be flashing.
If another network card is working this should be easy. This is the main problem which dont allow network adapter to work properly. Click on Update Security.
If the Internet works on another device it is safe to assume that the issue is the computer.
Then if there are light on your adapter they should also be flashing. This is the main problem which dont allow network adapter to work properly. If youre able to access the internet via Wifi but unable to connect to the Ethernet via cable dont worry. The issue of Ethernet not working might be related to a lot of things.