Macbook Constantly Loses Internet, but not Wireless Signal

I have a black 2008 Macbook (don't have the full specs on me since I'm on my work computer) and it constantly loses internet connection (i.e. I can no longer visit websites), however Airport continues to show full signal strength to my wireless network. I think it may be a DNS issue. Is it possible for the Airport card to go bad? Has anyone else had these issues?
FWIW, I'm using AT&T U-Verse for my internet connection. I think the issue is specific to my computer. My two roommates also have macs, and they have no problems with the internet dropping.
Any help is greatly appreciated. Thanks!

No idea if I'm honest. I used a landline phone on the same line as the broadband. When i used the phone, i could hear it crackling.Once they had done whatever they did, that crackling disappeared.

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BXB1905 wrote:
I tried the Apple diagnostics it did not work.
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Your profile confirms you are using Lion. Check out the following:
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
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Trust me when I say this coming from 20 years of experience.
Get a powered external drive, format it 1 Partition Option: GUID and OS X Extended Journed as the format in Disk Utility.
Download and install Carbon Copy Cloner, clone internal drive to external drive.
Set a schedule to remind you to do it at least once a week, keep it near your charger.
When you plug your charger in, do plug the clone and power the machine up, set the display to sleep only,
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If you want to boot from it, hold the option/alt and select it Startup Manager.
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It's simple, it's easy, it's more reliable and more powerful than what Apple does and it only takes plugging in a extra cable.
Make as many clones as you want, keep them time seperated, off site etc. etc.
Cables don't have network issues, clones can be verified in seconds merely by booting from them.
Clones protect your productivity, your up in seconds on a clone despite even the hard drive dying.
Software problem? No sweat, boot of the clone and reverse clone your problems away.
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Genius reservation http://www.apple.com/retail/geniusbar/ .
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Macbook Constantly Loses Internet, but not Wireless Signal

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