Doesn't connect to the internet anymore

Hi,
my macbook air doesn't connect to the internet anymore. Diagnostics don't find a solution, either.
Network status as follows:
wi-fi: green
wi-fi settings: green
Network settings: green
isp: green
Internet: Failed
Server: Failed
I am writing this on a different apple computer using the same network, ISP and so on. Obviously, this one works, and so do a couple of other computers in the house. Hence it can't be a problem with the router, ISP or so. Must be a problem in the macbook air.
WHo has an idea?

From the menu bar, select
 ▹ System Preferences ▹ Network ▹ Advanced ▹ TCP/IP
What values are shown for the following?
Configure IPv4
IPv4 Address
Subnet Mask
Router

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Hi Damien,
Thanks for your reply.
I had not created 2 separated wireless network. The airport extreme has had create wireless allowing it to be extended and the airport express has had it to extend since day 1.
The only device that does not connect to the airport express when it is far from the airport extreme here is the iPhone 4. I've tested 2 Windows based computers, 2 Macs, 1 Samsung TV and 1 Android phone and they all are able to connect to the airport express when the signal from the airport extreme is weak (please take a look on the screen shots on the original post).
The screenshots of the 2 devices' wireless set up can be found below:
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I have seen other people here on the Apple discussions complaining about the same issue with their iPhone 4 and iPad: would it be a iOs problem?
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Doesn't connect to the internet anymore

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