IMac Won't Connect to AirPort Network

Hi, folks —
I just switched my home wi-fi from a Netgear 600N to an AirPort Extreme Base Station with an AirPort Express extender closer to my office. Both are configured correctly—they work great with my iPhone, iPad, and MacBook Air.
But my Intel iMac from 2008 doesn't seem to be able to connect to the network at all—it just times out—and I have no idea why. Any ideas?
Removing the extender doesn't seem to help.

rkaufmann87, I'm embarrassed to admit that I actually just fixed the problem by using the wireless diagnostic tool that I didn't realize was built into System Preferences—it cleared whatever was confusing the system, and now the wireless connection is working great. I'll now be able to install the 10.8.4 update wirelessly, like the good lord intended.
Thank you for all of this.

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tests to try:
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-- Set your dns to 8.8.8.8 and 8.8.4.4 This is the google dns server. generally faster.
Check out your settings.
apple > system preferences > network
Double click on network connection you are using.
Pick the TCP/IP tab.
Verify that you have a DNS Server.
You can use
harddrive > applications > utilities > network utility
to diagnose the situation.
You can ping google.com.
Result:
Ping has started ...
PING google.com (64.233.167.99): 56 data bytes
64 bytes from 64.233.167.99: icmp_seq=0 ttl=244 time=215.362 ms
64 bytes from 64.233.167.99: icmp_seq=1 ttl=244 time=279.597 ms
64 bytes from 64.233.167.99: icmp_seq=2 ttl=244 time=189.747 ms
64 bytes from 64.233.167.99: icmp_seq=3 ttl=244 time=250.657 ms
64 bytes from 64.233.167.99: icmp_seq=4 ttl=244 time=183.232 ms
64 bytes from 64.233.167.99: icmp_seq=5 ttl=244 time=243.753 ms
64 bytes from 64.233.167.99: icmp_seq=6 ttl=244 time=173.108 ms
64 bytes from 64.233.167.99: icmp_seq=7 ttl=244 time=230.239 ms
64 bytes from 64.233.167.99: icmp_seq=8 ttl=244 time=180.639 ms
64 bytes from 64.233.167.99: icmp_seq=9 ttl=244 time=232.177 ms
--- google.com ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 173.108/217.851/279.597/33.615 ms
If that does not work, try pinging 64.233.167.99 Result:
Ping has started ...
PING 64.233.167.99 (64.233.167.99): 56 data bytes
64 bytes from 64.233.167.99: icmp_seq=0 ttl=244 time=189.655 ms
64 bytes from 64.233.167.99: icmp_seq=1 ttl=244 time=213.471 ms
64 bytes from 64.233.167.99: icmp_seq=2 ttl=244 time=257.873 ms
64 bytes from 64.233.167.99: icmp_seq=3 ttl=244 time=172.745 ms
64 bytes from 64.233.167.99: icmp_seq=4 ttl=244 time=226.723 ms
64 bytes from 64.233.167.99: icmp_seq=5 ttl=244 time=171.883 ms
64 bytes from 64.233.167.99: icmp_seq=6 ttl=244 time=260.308 ms
64 bytes from 64.233.167.99: icmp_seq=7 ttl=244 time=172.963 ms
64 bytes from 64.233.167.99: icmp_seq=8 ttl=244 time=198.840 ms
64 bytes from 64.233.167.99: icmp_seq=9 ttl=244 time=181.215 ms
--- 64.233.167.99 ping statistics ---
10 packets transmitted, 10 packets received, 0% packet loss
round-trip min/avg/max/stddev = 171.883/204.568/260.308/32.247 ms
If pinging 17.254.3.183 works but pinging Google.com doesn't. You have a bad DNS Server address.
I use Google.
Google provides free dns lookup. Their numbers are:
8.8.8.8
8.8.4.4

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system preferences/network
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http://support.apple.com/kb/HT2712
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Imac will not connect to Airport Extreme when configured WPA/WPA2
Posted: Jul 5, 2007 8:22 PM Reply
I just got my Imac to connect to the internet using my Airport Extreme but only by using WEP. I had my Windows XP SP2 machines connecting using WPA/WPA2 with no problem. The Imac will not connect using anything other than WEP, and 1 of the XP machines will not connect using WEP.(I have not tried the other XP machines) I had to set the Airport Extreme for an open network in order to let both computers access the shared hard drive and access the internet.
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Hawking Technology HWUG1A Wireless-G USB Adapter with Removable Antenna for Macintosh
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Click the “Kudos Thumbs Up" at the bottom of this post to say
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My wireless internet is working with all of my other devices but my imac will not connect to the network?

Can anyone help? My wireless connection is working on both my iphone4S and my ipad2, but my Imac will not connect to the network.

First run Software Update to make sure your iMac is up-to-date.
Even though things are working OK on other devices there may still be issues with your modem or router so it's best to start there. Locate the manuals on both devices and reset each. Do the modem first then the router. Next make sure the router has up-to-date firmware. If the problem continues after updating resetting and updating both devices then download and install iStumbler and let it run for about 30 minutes. iStumbler will scan your area for the Wi-Fi networks being used, pay attention to the channels each network is set to. Most routers are pre-set to channels 5 or 6 and if you are in a congested area and all the routers are set for channel 5 or 6 then you can see where there might be a problem. Set your router's channel to one not being used in your area, you have at least 14 channels to choose from. Also check to see if your router is using 802.11n, if it's not then it would be wise to upgrade the router to a faster device.
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3. Click Advanced
4. Click DNS tab
5. Click + sign
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7. Click + sign
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Hi,
I bought my iPhone 4s yesterday and I'm having the same problem, my laptop, my old HTC Legend and my work macbook all connect to my wifi no problems. My iPhone won't.
I've read through everything I can find on here, and on Sky help and have tried:
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Resetting network settings on iphone
Using MAC address access control on the router
Changing channels on the router
Switching everything off and on
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IMac Won't Connect to AirPort Network

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