MacBook Pro wifi not workin after configuring airport express

It happened twice with 2 different MacBook Pro in the same wifi.
I reset and plugged in an airport express to make a hard reset.
After that, it appeared in the wifi from my MacBook Pro, so I dibble clicked it to configure it as an airplay dispositive.
When my Mac was configuring it, it said waiting for airport express and then a problem occurred.
I tried with another MacBook Pro and happened exactly the same.
Now both macs can't connect to the wifi at home, well, it says it's connected but with an "!" Sign and not working. Just with that particular net.
Can somebody help me please?
Thank you very much!

Anyone please???????

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Does anyone have an answer to why my computer is showing a little gear spinning for hours? I have tried several things with NO luck.
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My MacBook Pro, does not start after pushing start button. The side bar starts and stops at half way.

Hy myneck,
Happy Holidays! The resource below may provide some steps to try if your MacBook Pro won't start.
Troubleshooting: My computer won't turn on - Apple Support
http://support.apple.com/en-us/TS1367
This article discusses what to do if your Mac won't turn on. To differentiate this from a display issue, be sure that when you press the power button:
You don't hear a startup chime.
You don't hear any fan or drive noise.
There is no video on your built-in or external display
If your computer has power but doesn't display any video, it may have one or more of these similar symptoms when you press the power button:
You may hear a startup chime.
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You may see a light from the Sleep LED (if your Mac has one).
Pressing the Caps Lock key on the keyboard causes it to light.
If any of these display-related conditions occur, see Troubleshooting: My computer has no video instead. Otherwise, continue with this article.
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Verify you have a good connection from your Mac to the wall outlet by confirming the power cord and adapter if present are securely connected and plugged in. To check if the wall outlet is working, plug in a lamp or other electrical device.
If the wall outlet is working and you continue to have no power try another power cord or adapter if available. If it works you may need a replacement cord or adapter.
Note: See Apple Portables: Troubleshooting MagSafe adapters for further troubleshooting with MagSafe adapters.
Disconnect all accessories that are plugged in to the computer, such as a printer, hub, or other mobile device.
If your Mac supports user-installable memory, solid state drive, or hard drive, and you recently installed any of these, make sure they are installed correctly and are compatible with your computer. If possible, reinstall the original memory or drive into the computer to find out if the behavior persists afterwards.
MacBook Pro: How to remove or install memory
MacBook: How to remove or install memory
Mac Pro: How to remove or install memory
Mac mini: How to remove or install memory
iMac (27-inch, Late 2012): Installing or replacing memory
iMac: How to remove or install memory
Reset the SMC.
If you are still unable to start up your computer after trying each of these steps, visit an Apple Store or Apple Authorized Service Provider (AASP) for further diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
I hope this information helps ....
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Kappy wrote:
Now, were I a mindreader this wouldn't be an issue, but unfortunately, I'm not.
WHAT??? Now that's a disappointment! I was sure the all-seeing, all-knowing Prof. Kappy would instantly discover the problem thru time and space....
Ok, back to the issue at hand, the Prof. is right. In none of the OP's participation, nor in any of his choir of followers save mommy power is there the least hint of what Apple product is failing. While y'all get a move on and disgorge the details, may want to try a Safe Boot. Hold down the Shift key prior to the startup chime and wait awhile. IF it starts, then it means you have some third-party software that's causing the problem. Else there's a strong probability a complete reinstall will occur in your near future.
In the future and in spite of what some purists may say, be sure to service the system disk BEFORE patching. By "service" I mean booting up the Mac using your Install DVD (Snow Leopard or priors) or booting in Recovery Mode (Command R, in the Lions and successors), running the Disk Utility found in that mode and doing a Repair Disk and Repair Disk Permissions. Until NO errors show up. Cause patching up an already damaged system will only make things worse.

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Dale Weisshaar wrote:
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skylaneval wrote:
I have a 15-inch Macbook Pro, current model with the i7 processor, which I purchased in August 2010. Last week, when I tried to turn it on, it would not boot (just got to the gray screen with the Apple logo and spinning wheel). I took it in for repair and was told that it had a bad hard drive. The hard drive was replaced and I got the computer back yesterday.
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