Let's see if I can make sense out of all this.
Awhile back, we moved into my mom's new house. There, I set up all the computers and the wireless internet. The router, which is a Linksys, is upstairs. The router is connected to the computer and is also connected to our modem. The modem then plugs into the wall. The computer downstairs runs off of one of those wireless chips. The chip is also a Linksys.
Everything has been working fine until two days ago. We went to get on the internet and it says that we aren't connected to the internet. We look upstairs and the little light that is suppose to be on is off. The light is labled "Link" if that is important. Anyway, my dad called up Comcast to see if they could do anything. They said the problem could take from 24-72 hours to fix. We went out for a little bit so I could buy a new laptop. When we came back to a working internet connection.
Now, I got excited thinking that I could finally connect to the internet with my new laptop! Too bad I really messed up. I couldn't connect to the internet with my laptop. It has a built in Wi-Fi chip or something... I went upstairs to see if I was too far away. When I got up, it still wouldn't connect. The other computers worked, so why wouldn't this one. I decided to reset the router by pushing the button on the far left hand side, i'm not sure what it is called.
Since I have done that, now none of the computers don't work.
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tl;dr version: I have 3 computers. Each one connects to our router. The router connects to the modem, but the modem cannot get to the internet. I have no idea what is going on and I need your help.