Can't connect with wireless

I have a first generation iMac G4 that I recently installed an early Airport card. In the past I have depended on ethernet for internet access but this computer will need to use wireless in its new location.
I can see my wireless network but each time I try to connect I'm unable. I've configured my router to use WPA and it failed, I then took all security off the network and it still didn't connect. I ran the hardware test on the iMac and the airport card passes, I've also checked for software updates and there were none. I do not have any MAC filtering on my network. I have an eMac, iPhone 4, iPod Touch and an iPad all successfully using the wireless.
Please help!!!

imacoholic wrote:
I can see my wireless network but each time I try to connect I'm unable.
It might help to reset the connection settings on your Mac using these steps:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
3) In the same panel as (2), define a new location and see if you can make that work.
4) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease".
5) In the folder /Library/Preferences ( not <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.
They may not help, but they'll only take a couple of minutes to try. Before you try these, note all your network settings, because the latter steps will destroy them.
Note that these steps are based on OS X 10.5 and 10.6, but they should work (with a few adjustments) with OS X 10.4.

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