IMac is not connecting to the internet. TCP/IP settings gone. Ethernet works OK.

I have 3 Macs, but today the iMac is not connecting to the internet. The others are fine. The iMac Airport antenna on the tool bar shows a strong signal, and when I pull down on it, it shows it's connected, but in Network Preferences is says Not Connected.
Then, in the TCP/IP tab, all my setting are gone!. The settings in my laptops are just fine.
I power-cycled everything, but the iMac is still without connection.
When I connect the iMac to the Time Machine/Air

I would test something else connected by ethernet like the laptop to make sure it was not a router thing
then I would connect the appletv by usb to the laptop and use itunes to restore the firmware if that was the issue
then I would try bringing it to a friend or relatives place and test it there
if all else failed it would resturn it under warrenty

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Which OS are you using (update your user profile).Try a
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http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.

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Then restart your iPad.
Hold the On/Off Sleep/Wake button down until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and hold the On/Off Sleep/Wake button until the Apple logo appears.
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-- Some support links are down for maintenance but should be available shortly.

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IMac is not connecting to the internet. TCP/IP settings gone. Ethernet works OK.

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