My iMac will not connect to time capsule used as base station in my roaming network

I have a network that is made of up a Time capsule as a base station and 3 airport express's used to extend my wifi coverage. It is setup as a roaming network with each express hardwired to the base time capsule. I have a iMac that will not connect to the base station, it will only connect to one of the remote express's. The iMac is next to the base satation. Other mac notebooks, iPhone or iPads all connect to the base station when they are near it. Only my iMac will not connect to it. Any suggestions as to why this is happening or steps I can take to fix this.

Hello FoxFamilyVA
Check out the first article below to go through some troubleshooting options to get your iMac to connect to your Time Capsule. I would go through and remove it from the list of known networks that you join and then add it back in. I would also recommend that you try and create a new Network Location to see if there is an issue with your current configuration.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Using network locations (Mac OS X v10.6 and later)
http://support.apple.com/kb/HT5289
Regards,
-Norm G.

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