All local network lights remain on with no flashing

1. Restart Modem
2. Double check all plugs, make sure they are firmly in
3. Double check any password or proxy settings and see that they're correct

Also I recommend renewing your IP & refreshing the connection.

Last resort to reset modem, find the little button on the modem (usually you have to use a pen/pencil as it's in a little hole) and hold it for 15 seconds.

If still nothing contact your ISP. They should be able to assist, or you can figure out a replacement if it is dead. It does happen.

I hope I've been of some assistance!