Imac wi-fi, it says I have a connection but can't get any internet access

Hi All,
Help please, just got a new iPad air and trying to use the Wi-Fi function on the iMac to access internet on the iPad. Used to be able to do this on previous tablet but now iMac won't wi-fi any of my devices- including new iPad. All devices and iMac say there is a connection but when I open internet apps it tells me there is no connection. Have reset iPad, turned wi-fi on/off, turned internet sharing on/off everything! Think the problem is the iMac, can anyone suggest a solution?
Cheers

I have checked the network in the system preference. The Built-In-Ethernet has a green light beside it and says "Built-In-Ethernet is currently active and has the IP address (bunch of numbers). You are connected to the Internet via Built-In-Ethernet."
When I click on "Assist me" and then "Diagnostics", The Network Diagnostics screen pops up and Scans for a while. There's five tabs on the left. Built-In-Ethernet is green, Network Settings is Green, and ISP is green. After scanning for a while, the tab by Internet goes red and says Failed below it, and the tab by Server goes red and says Failed below it. Then it asks me "Have you ever used this computer to successfully connect to the internet?" I say yes, and then it asks for the network port configuration that I would like to use. I choose Built-In-Ethernet, and it scans for a while and tells me "This computer appears to have a working internet connection, but cannot find www.apple.com. You may have typed the address incorrectly.
My neighbor has a wireless network that is unsecured. I use it all the time on my ipod touch. My imac finds it, connects to it, but I still have the same problem. No browser or mail will work.
Message was edited by: thescamdog

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I have checked the network in the system preference. The Built-In-Ethernet has a green light beside it and says "Built-In-Ethernet is currently active and has the IP address (bunch of numbers). You are connected to the Internet via Built-In-Ethernet."
When I click on "Assist me" and then "Diagnostics", The Network Diagnostics screen pops up and Scans for a while. There's five tabs on the left. Built-In-Ethernet is green, Network Settings is Green, and ISP is green. After scanning for a while, the tab by Internet goes red and says Failed below it, and the tab by Server goes red and says Failed below it. Then it asks me "Have you ever used this computer to successfully connect to the internet?" I say yes, and then it asks for the network port configuration that I would like to use. I choose Built-In-Ethernet, and it scans for a while and tells me "This computer appears to have a working internet connection, but cannot find www.apple.com. You may have typed the address incorrectly.
My neighbor has a wireless network that is unsecured. I use it all the time on my ipod touch. My imac finds it, connects to it, but I still have the same problem. No browser or mail will work.
Message was edited by: thescamdog

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Imac wi-fi, it says I have a connection but can't get any internet access

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