My wireless internet is working with all of my other devices but my imac will not connect to the network?

Can anyone help?  My wireless connection is working on both my iphone4S and my ipad2, but my Imac will not connect to the network.

First run Software Update to make sure your iMac is up-to-date.
Even though things are working OK on other devices there may still be issues with your modem or router so it's best to start there. Locate the manuals on both devices and reset each. Do the modem first then the router. Next make sure the router has up-to-date firmware. If the problem continues after updating resetting and updating both devices then download and install iStumbler and let it run for about 30 minutes. iStumbler will scan your area for the Wi-Fi networks being used, pay attention to the channels each network is set to. Most routers are  pre-set to channels 5 or 6 and if you are in a congested area and all the routers are set for channel 5 or 6 then you can see where there might be a problem. Set your router's channel to one not being used in your area, you have at least 14 channels to choose from. Also check to see if your router is using 802.11n, if it's not then it would be wise to upgrade the router to a faster device.
Next is if you are still having issues the problem could be your ISP's DNS settings. If you want to learn about DNS please read CNET's DNS Article and MacWorld's DNS Troubleshooting . Then use the instructions below to reset the DNS settings:
1. System preferences
2. Network
3. Click Advanced
4. Click DNS tab
5. Click + sign
6. Add 208.67.222.222
7. Click + sign
8. Add 208.67.220.220
9. Click OK.
10. Exit System Preferences

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