Explanation point in wi-fi icon and NO connectivity.

I'm trying to connect to my router wirelessly using my iMac (Mavericks). I have tried serval solutions, running the assistant, removing the wireless connections from the network preferences using the minus button, adding it again using the plus, forgetting all networks and trying again, etc. The router is secured using WPA/WPA2. I have also tried removing the security completely and connecting with no luck either. 
I can connect to the router with my iPad, iPhone, PS3, and Windows laptop so I'm going to assume it's a problem with my computer (iMac).
So please no "move your router", or "try plugging it into the router directly" solutions. One thing to note is I get the self-assigned IP address error in the network preferences pane. I don't think it's a hardware problem because I can connect wirelessly to other networks easily.
Thanks!

When you see an exclamation point in the Wi-Fi menu, from the menu bar, select
 ▹ System Preferences... ▹ Network
Click the Assist me button and select Assistant. Follow the prompts. You may get a warning that Wi-Fi is not available, that you're too far from the base station, or that you're using the wrong password.
Assuming that you've ruled out those possibilities, restart the computer and try again. If there's no change, click the lock icon in the lower left corner of the preference pane and authenticate, if necessary. From the Location menu at the top of the window, select Edit Locations. A sheet will drop down. Click the plus-sign button to create a new location. Give it any name you want. In the new location, set up the Wi-Fi service with the same settings you used before. Click  Applyand test.

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