A lot of DSL modems actually have routing functionality that interferes with your actual router. They tend to use a PPOE setup, which means you have to tell your modem to not do PPOE and use the settings that it had to tell your router it's a PPOE connection, complete with the login user/pass and external IP address the modem was getting. I know that sounds complex, so maybe just google on that subject with some keywords and you'll likely find the steps for it.
So my three year old started playing with buttons on the monitor, keyboard, or both. Now, colors don't appear as they did before -- things look washed out, for the most part. Any tips on what to look for to fix what he did? Thanks!