My iMac won't connect to the wifi it has been connecting to for a year.  All other devices still work.  Any suggestions?

IiMac won't connect to the wifi anymore. All other devices still work with wifi any suggestions?

Try the basics first:
   Change your router channel number.  Most times this works & is all you have to do.
Disconnect & reconnect your modem.  unplug it for about 10 seconds.  Plug it back in.  Do the same for Apple’s routers.  Wait for everything to reboot.
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer.   See these basic networking KB Articles:  http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT4628  Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
What to do when you can't connect to the Internet
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a  Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.
================
Have you read for possible solutions over in the "More Like This" thread over here?----------------------->

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    Hi Jeff,
    Thanks for the suggestion, but I tried that page and there was nothing on it that solved my issue. I ended up calling Apple Support for help and was advised there have been issues with the latest update of Apple TV. The strange thing was that after I had it unplugged for a few days, I plugged it in while on the phone with support and it worked again. The rep gave me his email/phone and asked me to call him back if I have the issue again. Apple is aware of the issue.
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    Care to share which OS you are using?
    Have you read for possible solutions over in the "More Like This" thread over here?-----------------------> 
    Change your router channel number.  Most times this works & is all you have to do. 
    System Preferences>Network
    Click the Assist Me button.
    In the next window that pops up, click the Diagnostic button & do the necessary.
    Research Knowledge Base for network problems that pertain to the OS that is currently installed on your computer.   See these basic networking KB Articles:  http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
    http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
    Manually provided DNS server addresses are higher priority than DHCP's
    http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
    ============================
    What to do when you can't connect to the Internet
    Also, run the Airport Utility app which is located inside the Utilities folder.
    =====================
    If using a  Linksys router, contact LinkSys Customer Support and/or post in their forums.
    If using Apple's Airport, please re-post over in one of the AirPort Forums.

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    ~~~~~~~~~~~~~~~
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