Why Can't I connect to the Wifi but others can?

[Kim]

Suddenly, the internet went down in my house. After a few hours, the rest of my flatmates was able to get and use the wifi back. However, my laptop and even my iPod touch was not able to get the wifi. It says that it is connected, but my laptop hows the yellow triangle with the exclamation mark. I tried to disconnect to it and also remove it from my wireless list and connect it again, it would then say that its connected and the internet would work for a few seconds then the mark would appear again. All my flatmates are able to connect to their phones and laptops. The number of devices connected to the wifi has never been a problem but now I can't connect!
I tried restarting, disconnecting, removing, forgetting...please help me!
I just tried it with cable and it works, but I would really like to have this wifi working!!

[D a y v e]

Whats a flatmate?

[Jose]

reset your router..