AE only recognized by Macmini after hard reset, not by my Macbook

I did a hard reset on my AE after some network issues (couldn't access the internet) and after that only my Macmini could see the AE and do the admin settings. My Macbook still couldn't see my network so I changed the channel to 10 and suddenly my Macbook was able to recognize my network. Why is that? I should be able to do the install from my Mybook too, if I didn't had my Mini what would be my solution then. Is it some firmware or anything that the Macbook missing? Please help!
Thx
MacBook Core2Duo/ Mac mini intel core duo Mac OS X (10.4.8)
MacBook Core2Duo/ Mac mini intel core duo   Mac OS X (10.4.8)  

Machines manufactured in Europe can see channels 1-13.
Machines manufactured in America can see channels 1-11.
Airport when initially set up defaults at channel 13.
If your airport base station is broadcasting on channel 13 and your macbook has been made or is using hardware made in america it will be unable to recognize channel 13.
Changing the default channel to something lower than 11 usually works.
If you didnt have your mac mini then you would run a direct ethernet cable between you express and your mac, and airport admin utility will be able to see the base station.
Hope this helps.

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