My imac won't connect ti wifi.

Lately when the computer tries to connect to WiFi it times out every time. All other devices work. I tried doing something that involved "renewing the DHCP lease" that didn't work. I've restarted the modem and router many times to no avail. When I restart the computer, it connecteds right away but only for seconds before it disconnects and times out every time. I searched the forums for help but I didn't see anything like my issue. Any ideas?

Try going into system preferences> Network> WiFi> Advanced and clear the preferred networks, if this doesn;t resolve, go into the Kecyhain access. This is in Applications> Utilities, delete any existing entries with your network name on them.
If this does not work then go to
/Library/Preferences/SystemConfiguration and delete the com.apple.airport.preferences.plist, NetworkInterfaces.plist, Preferences.plist and then restart.
This removes the the computer name in the Sharing section in System Preferences, so go back in there and make sure to put the computer name back in

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