MacBook won't connect to the internet!!!

I recently switch wireless service at home to At&t.
Since, my computer "connects" to my network, accepts my password, and shows full signal, but when I open Safari, or any other app that requires internet, I just get the "failed to open page because you are not connected to the internet" page.
My roommates connect to use our wireless network with their PC's just fine, and my Mac connects to other wireless service at school and work and works just fine.
I have been on the phone with At&t many times trying to troubleshoot and fix the problem. No success.
Apple charged me $49 to talk to them, with no success.
I HAVE ALREADY TRIED RESTARTING both my Mac and my router, I have reset the router, I have restored original settings in both Safari and my router, I have tried removing the security from our network in order to connect without a password, I have tried re-configuring the router to work with Macs....all no success.
I am very frustrated with the situation as I, like most people, require internet access for both school and work.
Any help, tips, or advice on the situation would be grateful.
Thank you.

Hi,
I have suffered the same problem after waking the imac from sleep mode, it seems to forget how to link with the web, I can see my wireless router in safari which tells me there isn't a problem with my network or internet connection. I've tried restarts and shutdowns then after a about 2 hours with no obvious outcome by checking settings etc., things return to normal as if nothing had gone wrong.
It's happened twice in the last 24 hours, started up when I got in from work read emails etc. about 6pm left it to go to sleep 7.30, then woke it up 3 hours later. Spent 1.5 hours trying to figure out what went wrong before giving up and going to bed.
This morning got up started machine 8.45am no problem with internet connection on safari and itunes. Put it to sleep at 10am and woke it 8.30pm up pressing the space bar with no connection again went through all the same procedures of checking and double checking settings. Then about 11pm it springs back to life enabling me to write this.
I have no idea what stops and what starts the problem.
(connection error's affected safari, mail, backup, firefox, intego-netupdate)

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TS1398 Help! MacBook won't connect to the Internet on my network. Never had an issue on other networks, other devices work fine, i.e. iPhone/iPad. Says it's connected. Plugged in Ethernet and tried other browser. Called ISP and all good on their end.

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You can't change it - just try aagain.
https://discussions.apple.com/index.jspa
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Hi, this has worked for a few...
Though all of these steps may or may not be needed, I'm including them all.
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
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10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
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10.4 instructions...
Is that Interface dragged to the top of Network>Show:>Network Port Configurations.
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2. Modem. Unplug and reconnect your modem, and make sure the connection is snug.
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https://discussions.apple.com/message/17028445#17028445
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Hello Rattisate,
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http://support.apple.com/kb/HT4628
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Hallo all,
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I tried re-installing Mountain Lion 10.8.3 but it didn´t help.
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Factory reset universal
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Tell us how you go.
Someone posted a solution.. See this thread.
Macbook can't find Time Capsule anymore
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http://arstechnica.com/apple/2015/01/why-dns-in-os-x-10-10-is-broken-and-what-yo u-can-do-to-fix-it/
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Today,
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You have 90 days of free AppleCare telephone support. Please give them a call right away, you can find the number by clicking AppleCare Contact Info

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*** When you post for help, please state which OS X is installed.
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