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You need to check whether ISP is working ok. To do this, connect your Mac Pro direct to your ADSL modem and see whether you can connect. If so, your Wireless may be too congested. Try to use a free WiFi scanner to check others who are on your channel. If you cannot find a clear channel to use, you may need to use another freq band AP, normally they are 2.4G WiFi, you can now use the 5.4G WiFi. You Mac Pro should support this band.
This is a confusing report. If you are successfully connecting two other computers to the router using the original router password, why can't you connect your MacBook Pro to the router using the same password? Or is it that the other two computers "know" the original password but you don't?
If one of the other two computers is a Mac, use the Keychain Access utility to look up the stored password for the router.
If not, use one of the other two computers to access the router's configuration screens directly and obtain the password that way.
You need to check your network card software your problem may lay there. I've seen this problem many times in the passed. I will install a wireless network card or software on someones computer and two days later it will not connect everything looks fine. No matter what I do it will not connect. Remove net software for the card or on board wireless reinstall and boom it works fine.
routers may need reset or configured off the internet or the start up cd. I take this a wireless router hooked to internet gateway. don't know not enough information you may need to tell me a little more. first try install of net-card software then set you working router to unsecure no pass word need see if you connect then change it to you wpa password protected.