Devices cannot connect to Wi-Fi

I have a Mac Pro that has a direct connection to the internet via ethernet cable. Attached to the Mac Pro is an Airport Extreme base station that provides Wi-Fi for other devices in the house. Everything was working more or less perfectly. Then I had to disassemble the system so some contractors could repaint my home office. Now that I've reassembled everything, I'm having trouble with the Wi-Fi (though the Mac Pro's internet connection via ethernet cable directly into the modem seems to be just fine).
My iPad, iPhone, and MacBook Air all show that they are connected to my Wi-Fi network. If you check the settings of all the devices, there is a check mark next to the name of my Wi-Fi network. And all the devices show the Wi-Fi connection with 3 full bars. But if you try to go online, nothing happens for a while except that the 'spinning circle' next to the Wi-Fi icon starts moving...and then I eventually get a dialog box with an error stating "Safari could not open the page because the server stopped responding".
If I go to System Preferences>Network on my Mac Pro, it shows that Ethernet 1, Ethernet 2 and Wi-Fi are all connected. Wi-Fi says "Wi-Fi is connected to (Name of my network) and has the IP address X.X.X.X". And it shows, as the Network Name, the name of my wireless network.
I've tried everythign I know to try. I've shut down my devices. I've cycled the modem. I've had the devices 'Forget This Network' so that I could go back and re-enter the password. But everytime I try to connect to the internet with my devices that *should* be connected to my Wi-Fi network, nothing happens, and I get this message about "the server stopped responding".
The only thing I can guess is that I have not reassembled all my devices correctly. For my modem: the power cord is connected to the outlet, the DSL cable is connected to the DSL filter at the telephone jack, and the ethernet cable goes from the modem directly into the ethernet port #1 on the back of my Mac Pro. For my Airport Extreme base station: the power cord is connected to the outlet, the ethernet cable is connected to the left-most ethernet port (with the circle above it) on the back of the Airport Extreme which then goes directly to ethernet port #2 on the back of my Mac Pro.
What am I missing here?

I wasn't getting any replies here, so I solved the problem by going out and purchasing Time Capsule. I needed the storage space anyway.

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Message was edited by: modular747

Devices cannot connect to Wi-Fi

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