Not picking up wifi signal on one of three Macs

We recently moved our computers, modem and airport to another room in our house. After the move one of our two desktop iMacs has been have trouble accessing the wi-fi. In order to get it to receive the wi-fi signal you must go to system preferences, network, assist me, then diagnostic. The network diagnostic box shows that the first three network status indicators, Airport, Airport Settings, and Network Settings all have green dots beside them. But the ISP, Internet, and Server are red. When you continue the three red ones then turn green and wifi access is restored but quite slow. The next time you return to the computer you have to go through the same process to access wifi. The airport signal strength bars are always full, so the computer is reading the wifi signal, just not able to access it. We have rebooted, changed the network name and password and other things as per our phone apple support session, and still it's not fixed. Interestingly, the other two computers in the house are not having any of these troubles. I'm wondering if something happened to the computer internally when it was carried, on it's side, from one room to the other. Any thoughts?

Is there anyone with any suggestions? PLEASE!

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