IMac G5 not connecting to my wi-fi network and not recognize password

I have friends and family that come to my home with different computers, give them password and connect to my wi-fi network perfectly. Now I have an iMac G5 model 1058, 1.8 Ghz with an airport express card. Try to connect to Internet, write the correct password and tells me that an error occurred. My wi-fi network was set up on my Mac Pro 1,1. Even a Mac power G4 laptop connects flawlessly to my network from first moment. If you have any suggestions I would appreciate very much.
Thanks Apple family.
You are the greatest.
Beltran

I'm writing this reply to myself, just in case someone encounters the same problem. I open my Mac Pro, open Airport Utility, click on the image of the Airport Express and click on edit. In the following window click on the bar Wireless, and in the line Wireless Security, changed WPA2 Personal, for WPA/WPA2 Personal. I had noted that the iMac being an older machine didn't have WPA2 Personal, only WPA. After I changed the setting went to the iMac connected to my network, enter the password that never before accepted, and everything is running perfectly now.
Thank you for the 24 views that I have at this point and if is of any help to anyone my solution found just applying common sense, makes me happy.
Thank you all.
Beltran

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