IMac can see everything on wireless network except for internet

My iMac 3.06GHz Intel Core 2 Duo 24" iMac running 10.5.8 has been perfectly fine for a couple of years. Suddenly it will not get an internet connection on the wireless network in our home. We have several other devices on the network that have no trouble using the internet. The iMac can access these devices via wireless, just not the internet.
When it's attached via a LAN cable plugged into the Airport (Dome type) the internet is fine.
We're flumoxed.
Any suggestions greatfully received.
purplejoolz

HI,
Try the information in the Airport Troubleshooting Guide and see if you can resolve the problem that way.
If nothing there helps click here for the Airport Extreme Base Station Setup Guide.
http://manuals.info.apple.com/enUS/AirPort_Extreme_Base_Station_Setup_Guidev4.2.pdf
Type Command + F on your keyboard. Then type in: Reset top right side of your Safari window just under your Bookmarks Bar then press return on your Keyboard.
Follow the instructions to reset your Airport base station.
Carolyn

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I have a mid-2010 iMac and just purchased a 2TB TC, I just found out that it can't join existing wireless network with new AC standard so attached to iMac via ethernet with TC's wifi turned off. How do i access TC now? not showing up in disk utility or on desktop. It is working fine with TM. My cheeper seagate drives etc kept crashing, so i didnt trust cheeper back up options anymore. Connected those drives to TM via firewire and could see the drives and access them.
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I connect to the internet via airport only and it is pretty fast.
I was assuming airport in this statement in your first post meant the TC or the Express.. but I now realise we are still in the mass confusion stage where apple calls everything wireless an airport. So what you mean is the airport internal card of the computer??
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If the computer is close it will be faster than the FIOS.
You can run both wireless networks with different names.. so it is clear which is which. But you can also setup roaming so the computers themselves pick which is the best wireless.
I tried extending the wireless net work and tried joining wireless network, but the TC kept crashing and I had to keep resetting the TC. the Apple support person said these, extend wireless network and joint wireless network, are no longer a connection option with the new TC because of the new AC protocol.
Thanks again!
You cannot extend to a non-apple wireless router.
You cannot use join a wireless network because when you do the ethernet ports will be cut off.
But that has not changed.. I don't think Apple support is correct.. there has been no change with the AC model.. it is simply a fact that apple routers do not work in join wireless mode other than as a dumb client. The same applies to AC as to the earlier version.. but I have asked another person to check this.
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IMac can see everything on wireless network except for internet

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