No IP address

1. What Airport device are you using?
2. What is it connected to?
3. Who is your internet service provider?

In addition to hopkapi's questions, are you using a static IP for your computer, and what version of OS X are you running?

So you're using the Sky router. Go to System Preferences>Network and take a screenshot, then post it here. Thanks.

BTW, you've already marked the question solved.

Ah, so this is technically a forum for people who are using Apple routers, though considering I'm a fellow Sky customer I'm generally pretty aware of their network gear (including much nerdy grrring at their lack of proper PPPoE on the network side).

1. Can any other devices connect to the internet via the Wi-Fi network from the Sky router?
2. Is the Network Name in the Network preference pane the same as the one that you either set, or which is on the sticker on the bottom of the Sky router?
3. Have you tried restarting the Sky router itself?

Just seen the second screenshot. Click the dropdown next to Network Name, then select the name of your wireless network, or if you didn't change it yourself, the wireless name on the sticker on the bottom of the Sky router. You'll find the password you need on the sticker too.

Well as I'm with Virgin Media I might not be able to help as much. Can you actually see your WiFi network? Have you tried renewing your DHCP lease? Have you tried pinging a host from your Mac (in Network Utility or Terminal)?

Just seen the 2nd screenshot. Connect to your Sky WiFi network using the provided name and password.

Message was edited by: edex67

OK try using any other machine to get to the Sky router's config page and change the password.

That's weird, just to clarify, you're using the password on the sticker, including the capitalisation it has, not the number it also has?

The problem is that it's failing to basically connect to the router at all, apparently due to the password being wrong, so the router doesn't hand it an IP address like it should.

I'd definately try changing it like edex suggests, and then see if it fixes it. Though it might bug your flatmate in terms of him having to connect to a differently named network and re-enter the password, you could also try changing the network name at the same time to make it less likely that an old, incorrect password for the same router, could get sent.