Macbook Air won't connect to Airport Extreme!

I'm at a loss here.
Last week I got drive corruption because I lost connection while writing data to an external drive connected to my Airport Extreme (while using my iMac).
I had noticed the drive connection was dropping quite often, both using the iMac and Macbook Air...
After doing a bit of searching, I learned it could be that the Airport Extreme was dying... and indeed it explained why my internet had been so painfully slow at times too, which I had been blaming on the computers or browsers, not even thinking for 2 seconds about the router!
So I did the normal thing, and ordered the new Airport Extreme (mine was the 2nd generation, dating back 2008, so it was normal I upgraded).
Yesterday I installed the new Airport Extreme and everything seemed to work like a charm. Internet was fast and the drives didn't lose connection once on the Macbook Air (I didn't have a chance to test the iMac... altough the error message wasn't displayed anywhere when I looked at the screen this morning, so I guess it was good there too).
I made sure not to write anything on the drives, though, just to make sure the Aiport Extreme did work OK...
And this morning, what do I see on the Macbook Air? Impossible to connect!
Internet works fine, no problem!
If I check Airport Utility, the Airport Extreme is there, green signal, everything's A-OK. And disk sharing is enabled, I double-checked.
I checked on the iMac... I can access the drives, just like yesterday.
But on the Macbook Air, I see the Airport Extreme icon in the Finder, but when I click on it I get the "Connecting..." for a while, until I get the "Failed to connect" and an error message saying it's impossible to connect to the server, to check if it's available and with the right IP address, etc.
How could it be offline, busy and/or with the wrong IP address if it's giving me internet and showing up as perfectly healthy on the Airport Utility???
How could it be not working, when it's working perfectly fine with the iMac???
The only thing I could see is if somewhere in the system the wrong info is sent (the right one for internet, the wrong one for Finder), but I don't know where that would be or how to change it.
I tried the usual restart, to no avail.
I tried removing the network in System Preference, and putting it back, no luck.
As I said... I'm at a loss.
How could it just stop working, and just stop for the drive sharing?

Reset the AirPort Extreme base station >  Resetting an AirPort base station FAQ

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    Message was edited by: kjvarga
    Message was edited by: kjvarga

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