Airport problem - cannot connect to the internet

I'm having problems connecting to my home wireless (that before it didn't happen).
Anytime I turn on airport and choose my network, i enter my wpa2 password but my mac doesn't recognise it, and shows me the error "connection has exceeded Time Limit".
I already tried to:
- delete the my network from the list.
- add it manually using the "+" button
- run the network assistant, but it says that my password is wrong (but it's not!!!)
- access my network ith my smartphone, and I can connect without any problems!
- acess with ethernet - and it works - i can connect without problems!
Sometimes I get an exclamation mark in the airport icon, but I already checked my network preferences and I'm sure that the encryption wpa2 is selected.
I think that I entered in my network only once, but the connection was soooooo slow (even after renewing dhcp) that the connection lasted 1 minute.
Can anyone help?
I own a macbook pro - snowleopard 10.6.8

What type of router are you using?
I'd like you to check the mac address filtering to make sure that's turned off.

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I currently use a Mac Pro 10.8.4 and have a time machine for wireless 6.3 (630.34). Sometimes I cannot connect to the internet and use network preferences to diagnose the issue. This results in being told to restart the wireless. The airport utility includes the drop down option of restarting but is not clickable so I can't choose it.
With my prior macbook and same time capsule, etc if i had problems connecting to the internet I would run network diagnostics to help out. This included clicking on the airport utility ---> base station --> restart. This worked most of the time.
Bottom line, is there something I am missing in not being able to restart the wi-fi remotely? ]
Thanks in advance

You are likely forgetting a step.
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AirPort does not have an IP address and cannot connect to the Internet.

Wi Fi problems
I have recently changed from a old netgear router to using a vigor 120 modem with airport extreme
Internet connection is established but my airport express reports "AirPort does not have an IP address and cannot connect to the Internet." although status is ON and the correct wifi address appears.
My iPhone also identifies the correct network but cannot connect
Any suggestions?

I don't have any phones, so not aware of the options, but on a Mac to fix this problem it'd likely be...
Instead of joining it from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed. Before I went through network diagnostics and all of that stuff in system preferences, and then I tried the "Join Other Network" method, and now it works like a dream.
https://discussions.apple.com/message/17028445#17028445
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Click Network
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Select your access point and Remove your access point with the minus button.
Launch your keychain access in Utilities and delete your access point keychain entry.
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~~~~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

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http://eshop.macsales.com/item/Edimax/EW7722IN/
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There are USB solutions also. However, all PowerMac G4 towers had only slower USB 1.1 ports, so any USB wireless adaptor can only run at about wireless 'B" speeds (slow) unless you also install a PCI USB 2.0 adaptor card. Doing that would allow a USB wireless adaptor to run at its maximum rated speed. These items working together would accomplish that:
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Newer Technology MAXPower 802.11n/g/b USB Adapter + Plug and play direct or with extension cradle
USB PCI adaptor:
http://eshop.macsales.com/Search/Search.cfm?Ntk=Primary&Ns=P_Popularity%7c1&Ne=5 000&N=7069&Ntt=USB+PCI
Each approach has its advantages. The PCI wireless card is a one-piece solution that takes up no desk space. The USB2 card+USB2 Dongle gives you more fast ports for transferring date from other external USB devices (primarily cameras and external hard drives) at hugely faster rates than can the original ports. I have a USB 2 PCI card in my G4 tower strictly for transferring images from my digital SLR camera in a timely manner.

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iOS: Wi-Fi or Bluetooth settings grayed out or dim
One user reported that placing the iPod in the freezer fixed the problem.
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Airport problem - cannot connect to the internet

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