Linksys help. Already tried to search forums. AirPort 'on', full signal strength but cannot connect to internet. PC, iphone, ipad all connect fine. Any ideas?

So I have been using my imac for 15 months. Never had a problem with going online. Until yesterday. Now its impossible. I am connecting via a linksys router (model WRT54G2) version 1.5. I have tried resetting modem, router. Nothing. Keep in mind my PC, iphone, ipad all connect fine to the wireless signal. It is only the imac that won't connect. The strange thing is when I check network settings it says it is connected to a linksys router at full strength. But when I click Safari, it says I am not connected. I am completely at a loss. Any help is much appreciated as Apple wants to charge me $50 for tech support, linksys $40 and Cox Communications $75. I love the lack of customer service.

I resolved a similar internet connection issue at a friends house recently, the problem was the router was set to only accept 5 wireless devices. This was not an issue before, but soon as his sons got a new wireless phones and a Mac Book Air, it used up all the available DHCP connections from his router.
His computer had the same issue,
- was connected,
- had a 169.xxx.xxx.xxx address
- did not have the DNS or router address in his current network settings.
The key point here is the same as yours, that all other devices were connected and could surf with Safari, except for that one device, in your case the iMac.
I determined his problem by manually assigning a 192.168.1.x IP address, subnet mask of 255.255.255.0, dns for his ISP and router address of 192.168.1.1. This worked, however it wouldn't when set to DHCP... went back to a 169 address.....
The real problem, the router was config'd to allow only 5 dhcp addresses to be giving out, once the 6 device tried, it would show a wireless full bar connect, a 169 address and wouldn't connect to the internet as Safaria stated it wasn't connected to the internet.
The real fix is to raise the number of dhcp wireless devices to a higher number, or possibly shorten the lease times so others can connect. He couldn't remember the password he changed on the linksys, so I left the network settings on his 6th wireless device in manual mode till he does remember the linksys password.
I bet thats was your case too. Linksys/Cisco is one of the best routers out there, I'd use airport Apple's second, and would not recommend NetGear because of support and technical issues in the past.

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Plz someone help me.

It's rather difficult to give you advice since you do not say what you have tried or anything about your networking equipment but your underlying problem may be that you are not really be properly connected to your WiFi network.
Your router may not have given your iPad a valid IP address. Go to Settings > Wifi > your network name and touch the ">" to the right to see the network details. If the IP address starts with 169 or is blank then your router didn't provide an IP address and you won't be able to access the Internet. Other devices on your network may still have a proper IP address and continue to function.
Sometimes the fix can be as simple as restarting your router (remove power for 30 seconds and restart). Next, reset network settings on your iPad (Settings > General > Reset > Reset network settings) and then attempt to connect. In other cases it might be necessary to update the router's firmware with the latest from the manufacturer's support web pages.
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Here is a couple of screen shots:

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Shaishel,
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Thanks

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This is extraordinary. I have moved the router and also tried resetting it to its factory strings. We have had this router for over a year and all our devices have always worked. Now all four laptops will not connect to the internet. Only one oMac and our phones and iPad.
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Help! My Mouse pad is not working properly. The arrow cannot be controlled, it just keeps jumping all over the page. How can I stop this?

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There are several possible causes for this issue. Please take each of the following steps that you haven't already tried until it's resolved. Some may not apply in your case.
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Hi sunnylordz,
Thanks for using Apple Support Communities. Based on what you stated, it sounds like you have no service on the iPhone. It looks like you have already done some troubleshooting. There is one step you did not mention trying that i think is worth trying.
If you see No Service in the status bar of your iPhone or iPad - Apple Support
Remove the SIM card. If the SIM card is damaged, worn, or bent, or if it's too big or small for the SIM tray, contact your carrier for a new one. Then reinsert the SIM card.
Cheers,
Mario

Lion mountain newest update :I loos the internet connection, but the network shows connected. And IPhone, IPad stay connected and work. Only the MacBook Pro , which worked perfectly before with Lion unless I updated to Mountain. I have tried everything.

I have a MacBook Pro, Early 2011, 2 GHz Intel Core i7 which I udated some days ago with Lion Mountain 10.8.2. Before it worked just perfect. Now, since the update, I loos the internet connection after a wile, (at the beginning every 20 sec, now up to 4 hours) even that the sign of the WiFi network connection shows to be perfectly connected.
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I FINALLY SOLVED THIS ISSUE!!!!
New routers have "mixed" modes for your network; this means that it will automatically choose the best option between wireless-B, wireless-G and wireless-N network modes. I used to experience this issue using the 2.4 GHz. mixed mode wireless network.
Thankfully, my router can create 2 networks: a 2.4 GHz. network and a 5 GHz. network.
When I randomly changed this value to "use only wireless-B and wireless-G" trying to fix an issue with a wi-fi expander, the iMac wi-fi issue dissapeared! I tried it with wireless-N only, but it didn't work.
So, finally, I have a 2.4 GHz network with only wireless-B and wireless-G modes which works PERFECT with the iMac, and a 5 GHz. network with a mixed* wireless mode for everything else mode.
*PD: by "mixed" mode it means that the router will automatically choose between B, G and N network modes as it fits better.

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Take the device to Apple or an Apple authorized service center and let them check it out.

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If you mean that you cannot remember the password for your WiFi network this will work for you - or it should work if you are the administrator on the Mac.
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If Keychain is locked - you must enter the administrator password there as well to unlock it and access the password.
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Linksys help. Already tried to search forums. AirPort 'on', full signal strength but cannot connect to internet. PC, iphone, ipad all connect fine. Any ideas?

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