HT4628 Wifi detected but doesn't work

HELP!
My good old Macbook Pro stopped working online. Every other device works with my DSL wireless modem/router (iPhones, Wii, Satellite receiver, iPad). The diagnostics tell me the Internet and Server failed.
I tried to go direct with an Ethernet cable with the same results.
I think the problem started when I allowed Firefox to upgrade Mozilla yesterday. I tried to delete the browser, library files, reset the PRAM, adjust modem/router settings. Something is still wrong, but strangely I was able to connect to update to Apple to update my software (under Apple menu)....
DSL- AT&T
Router- 2Wire 2701HG-B
Can anybody my old faithful machine? I was hoping to last a little longer before retirement.
Thank you in advance,
Mike

You may not really be 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.
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.
If you need more help please give more details on your network, i.e., your router make, model and version, the wifi security being used (WEP, WPA, WPA2), etc.

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HT4628 Wifi detected but doesn't work

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