Airport will not connect to Linksys router after iDisk sync force quit

Hi,
Hoping someone can help me here, kinda at my wits end.
A week ago I was video ichatting and restarted my MacBook because the video feed was sluggish. I thought a restart would help.
Unknown to me was that my iDisk was syncing. I recieved an warning dialogue box and was given the option of canceling the restart or force quitting the iDisk sync. I choose to force quit and proceed with the restart. After choosing to continue with the force quit I received an error message, it had the phrase "Mirror Agent" in it, and then my MacPro restarted.
Since that first restart, I have not been able to connect, using Airport, to my Linksys Wireless router (model # WRT54 GX4).
This is where it gets strange. Airport sees the router, displays a signal strength, shows up on my list of perfered networks...it displays all of the signs of a fully connected router but when I try to access the web, check mail or use iChat I cannot because Safari, Mail and iChat tell me that I am not connected to the internet.
When I ran the network dianogistic tool, it first asked me why I would want to run it because it thought I was already connected. After running the tool it still came back with the same results, I was connect to the internet. But I still couldn't launch Safari, it just hung.
This is where it gets really wierd. My wife, she's on a HP, can connect, using her built-in wireless card. Even after changing the Firmware on the Linksys router, her pc can still connect.
And here's the icing on the cake. There are some unprotected wireless networks on my street. I can connected to those but not my own! Something has to be blocking the signal between my AirPort card and the Linksys router. Does that make sense?
And if there is one saving grace to all of this, I still can connect to the web using the built-in Ethernet.
Here's what I have tried:
Removed Perfered Network, restarted MAC, added network back, still no connectivity.
Removed security (was using WPA/WPA2) from the router still no connectivity.
Removed Airport Keychain, restarted MAC, added router back, still no connectivity.
Repaired the permissions on my HD, someone at work told me to try that, still no connectivity.
Updated firmware to Linksys router to version 1.00.20, no connectivity.
Rebooted Linksys router and cable modem, still no connectivity.
Thank you to all in advance for reading my rambling note and forgiving my poor spelling (it is way past my bedtime and the keys are really blurry). I am still very new to Mac's and appreiciate any help that you can provide.
Cheers,
Alan
[email protected]

Sounds like you have two wireless networks on the same channel.
Change the channel on the Airport Express.
iFelix

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