Mac shows wireless internet connection, but Safari says "computer isn't connected to the Internet"

Situation:
Computer shows internet connection (full bars), but won't actually connect to the internet and load webpages
Attempted Fixes:
Reset Safari
Quit Safari
Restart the computer
Turn off the computer with router unplugged
Turn off Airport
Swear at the computer
Swear at the internet
Unplug the router and turn the Airport off too
Additional Info:
Second computer (mac) connects to the internet so it's not an internet problem.
Last few days the internet has been slowly dying on the computer (Mac OS X) in question. Meaning that the internet asks me for the router password constantly, which was a new development.
I have seen information about reseting Plists and a few other weird things, but I didn't want to do anything drastic based on someone elses issue. I figured it's best to bring my specific issue to the forum before destroying my Mac by randomly deleting Plists.
Any thoughts appreciated.
Dan

Swear at the computer
Swear at the internet
Excellent troubleshooting solutions which usually works.
Which os version are you using?
First contact your ISP. You need to confirm that the issue is not on their end.
Change your router channel. Sometimes this is all you will have to do.
Power cycling the router. Read the router's user manual or contact their tech support for instructions.
System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
System Preferences/Network- Unlock padlock. Highlight Airport. Network Name-select your name. Click on the Advanced button. Airport/Preferred Networks-delete all that is not your network.
Place a check mark next to "Remember networks this computer has joined." Click the OK button and lock the padlock. Restart your computer.
http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease
No internet connection (wireless)
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."
Other resources to check into:
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
Configuring 802.1X in Mac OS X Lion and Later
Non-responsive DNS server or invalid DNS configuration can cause long delay before webpages load
Netspot
How to diagnose and resolve Wi-Fi slow-downs
Pv6 troubleshooting
Mac OS X 10.6 Help: Solving problems with connecting to the Internet
What Affects Wireless Internet?
Solutions for connecting to the Internet, setting up a small network, and troubleshooting
If using one of Apple's Airport routers, read its user manual or post in its forum area. If using a 3rd party router, read its user manual, contact their tech support department/website or post in its forum area.
Thank you for listing all the troubleshooting you have tried. Makes it so much for the users here in trying to help.

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edit-
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