Can't connect to internet

Make a New Location, Using network locations in Mac OS X ...

http://support.apple.com/kb/HT2712

10.5.x/10.6.x/10.7.x instructions...

System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.

The interface that connects to the Internet should be dragged to the top of the list.

Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.

Then... Try putting these numbers in Network>TCP/IP>DNS Servers, for the Interface you connect with...

208.67.222.222

208.67.220.220

Then Apply. For 10.5/10.6 Network, highlight Interface>Advanced button>DNS tab>little + icon.

DNS Servers are a bit like Phone books where you look up a name and it gives you the phone number, in our case, you put in apple.com and it comes back with 17.149.160.49 behind the scenes. 🙂

These Servers have been patched to guard against DNS poisoning, and are faster/more reliable than most ISP's DNS Servers.

Hmmm, have you powered down everything & reset the Router, wait 5 minutes, power up Modem, wait 3 minutes, power up Router, wait 2 minutes, power up Mac?

If that doesn't work you might try changing the channel on the Router.

10.5/10.6 instructions, System Preferences>choose interface>Advanced>Proxies Tab, make sure none are set, like for HTTP & HTTPS.

Is Airport/Wifi showing a good IP, or one in the 169.254.x.x range?

Dang, this is mysterious!?

Open Network Utility>Traceroute tab & traceroute this, how far does it get?

google.com

Traceroute has started ...

traceroute: Warning: google.com has multiple addresses; using 173.194.33.38

traceroute to google.com (173.194.33.38), 64 hops max, 40 byte packets

1 10.0.1.1 (10.0.1.1) 4.803 ms 1.060 ms 0.952 ms

2 192.168.15.1 (192.168.15.1) 2.087 ms 1.704 ms 1.523 ms

3 * * *

4 10.41.164.213 (10.41.164.213) 73.551 ms 51.027 ms 60.034 ms

5 64.13.115.205 (64.13.115.205) 64.994 ms 71.061 ms 60.058 ms

6 64-13-49-226.war.clearwire-dns.net (64.13.49.226) 69.826 ms 69.918 ms 60.112 ms

7 64.13.115.170 (64.13.115.170) 65.744 ms 96.083 ms 49.768 ms

8 209.85.249.34 (209.85.249.34) 85.428 ms 165.785 ms 70.225 ms

9 209.85.253.26 (209.85.253.26) 54.811 ms 65.923 ms 60.128 ms

10 sea09s02-in-f6.1e100.net (173.194.33.38) 64.997 ms 71.136 ms 60.270 ms

Wow, that sure is slow!

We now need to find the IP of your Router or Modem, & the IP of your Mac, do you know how to find them?

Any that start with 192. or start with 10. are completely safe, those are local & inside IPs.

The one you don't want to post would be the one you find by going...

What's my ip...

http://www.whatismyipaddress.com/

Is there another device connected with a Static IP set to 192.168.1.70 ? Or 192.168.1.71 ?

Is the Mini set to... Using DHCP ?