Macbook "connected" to wireless, but no internet/email.

I have a macbook pro that is running Mac OS X Lion. I've had it for about three years without problems. Recently, however, it stopped being able to connect to the internet through my home wireless network. Nothing changed about my macbook or my network/modem/router. Other devices in the house (PC, iphones) are able to connect to the internet via my wireless network, but not my macbook (and, incidentally, neither can my ipad now). If I take my macbook to any other wireless network (coffee shops etc.) it connects to the wireless and I can access the internet without problem. I have tried the online apple chat support feature, we tried a few things (can't remember what exactly) and have also had my internet service provider reset my modem. Nothing has worked. I've tried various interventions suggested on some message boards here (restarting, resetting modem, deleting and reselecting airport etc.) and nothing has seemed to help. Running network diagnostics comes up with nothing, and it states that there is nothing wrong with the wireless connection or the internet. This is very frustrating, because I can't take it into an apple store (it will most definitely work on their wireless) and it doesn't appear to be related to my ISP (because of the other devices that are able to access the internet) so bringing the cable guy out won't be of much help either. There is something wrong with the communication between MY wireless network and the internet on my macbook.
Wondering if anyone has had this problem recently? Anything that has worked for them? I'm about as computer savvy as a squirrel, so any instructions would be most helpful if they were simple and easy to follow. Thanks so much!

Hold down the option key and select the Wi-Fi menu in the menu bar. What values are shown for the following?
          PHY Mode
          Channel
          Security
          Signal/Noise or RSSI
          Transmit Rate
Please do not post the BSSID, as that information is private.
Now hold down the option key again and select
           ▹ System Information... ▹ Network ▹ Wi-Fi
Compare the two-letter Country Code with the ISO code for your country. Does it match? The code X0 means that the country couldn't be determined. The code X3 means South America, not otherwise specified.

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Macbook connected to network but no internet

Hello,
I am having a very strange and concerning internet issue with the Macbook in my household. It can't access the internet even when connected to a wireless network. I know this is not a network issue because a Macbook pro, iphone, and ipod touch all connect to my network at home and can access the internet just fine. Also, the Macbook was unable to access the internet when connected to the school network while my iphone and other computers could.
The problem started suddenly last Monday. Prior to that the internet had been working both at home and at school. It appears to be connect to the network because there are full airport bars and a check mark next to the network (in both locations) but it can't find the airport in the Airport Utility (while at home since the school doesn't use airport). Additionally, it wouldn't connect to the internet directly through the ethernet port either when I plugged it directly into the cable modem.
In the System preferences it has a Self Assigned IP. The preferences are the same as they were when it was working and nothing looks wrong. On Thursday I tried the fix someone posted on this forum of deleting the network from the preferred networks and then adding it again and it worked at home for a day but it still wouldn't work at school and yesterday it stopped working again at home. When I tried to the fix again it didn't work. Also, I've tried repairing permissions twice and that hasn't done any good either. Additionally, it happens under both users on the computer and the test user I created.
Any help would be appreciated.
Message was edited by: witchkitten

Sorry, wrong macbook. This is one of the aluminum one. Reposted in the correct topic.

My iphone is connected to wireless but internet doesn't work

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Macbook will connect to wireless but not the internet

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Macbook Pro connected to wifi, but no internet connection

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Problem with macbook connecting to wireless: help please

thanks for reading this thread.
i have a linksys WRT54G2 router connected straight from the ethernet port of a cable internet connection. it's been working fine for the past month or two for both me (using macbook 10.5.6), my flatmate (running vista pc) and my girlfriend also running a macbook.
but, the last few days i've been having problems getting connected. which are:
not connecting to wireless network automatically, and asking for password which is already remembered in keychain
getting connection timeout when trying to connect
getting invalid password, even though password is correct
websites taking around 2 mins to load when connection is eventually made
the internet is working fine on both my flatmates and girlfriends computers, but jut doesn't seem to like mine. heres what i've done already:
restored router to factory settings and updated with latest firmware
cleared all known wireless networks within network preferences
tried both firefox and safari
accessed router using IP address and loaded pages instantly
works fine connected to router with an ethernet cable
the only thing i havn't tried is a different wireless network, which i'm going to try tomorrow when i go into university.
has anyone any idea what the problem may be? like i said, its been working fine for the past 2 months but has just decided it doesn't like my macbook.
any help or suggestions would be great, thanks alot

I had the same problem as you. It all started when all of a sudden my macbook wouldnt automatically join my home wifi that is usually does. I ignored this issue because it still worked, and this persisted for a few months. After a while, the situation got worse and after waking up from sleep, my wifi signal would go strong at first, then weaken until it kicks me off, and i no longer could reconnect as I would get a connection timeout error. I just went to the apple store and they replaced the airport card for free for me.
So basically your airport card is slowly dieing, replacement is inevitable.

Airport is connected to router but no internet

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Hi Kelly Chant-
Any chance that the little AirPort antenna in the back has become dislodged? Try powering down everything on the network including routers and/or switches, wait 10 minutes, turn it all back on and see what happens.
Luck-
-DP

Macbook "connected" to wireless, but no internet/email.

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