C4850 and iMac wireless problems.

Iv'e had a look through all the other threads on this subject and havn't been able to find a solution.
I set up the printer which works fine in the USB, but I can't get it to work through the built in Airport Extreme on my iMac.
I go through the set up procedure for setting up on a wireless network after the software returns the IP settings for the printer I hit continue that tells me the device is not reachable. I've had a look through all the airport set up screens I can find. I don't know if the problem is with the airport setup or the printer. Any help would be appreciated.

Let's try a shortcut. You'll need to know the SSID of your wireless network, the type of security (none, WEP or WPA-PSK) and the if you have encryption enabled, the security key.
First, disconnect the USB cable and reset the printer's network configuration. You can do this by pressing the wireless button, then wireless settings, then scroll down to Restore Network Defaults and press OK. After a few moments, the blue LED will turn off indicating that the radio turned off. This indicates that the printer's network configuration has turned off.
Next, turn on the radio by selecting Enable Wireless. At this point, the printer is setup in Ad-Hoc mode using the SSID hpsetup.
Now, connect to the printer's wireless network named hpsetup. Once you've connected, start Safari, open Bookmarks and then Show All Bookmarks. On the left pane, select Bonjour and you should see the C4850 printer listed. Select this bookmark and the printer's webpage should appear.
Next, select the Networking tab on the printer's webpage followed by the Advanced tab. On the webpage form, enter the SSID of your wireless network, select Infrastructure and the type of encryption. Finally, enter the security key (if necessary) and then select Apply.
If all went well, your Mac will disconnect from the printer's wireless network hpsetup as the printer connects to your home's wireless network. Reconnect your Mac to your home network.
Last step is to create the print queue. Go to System Preferences, Print and Fax and press the plus sign to add a new printer. You should see the C4580 listed. Select this and the Mac should find and add your printer.
You now have basic wireless printing setup. If you want to scan from your Mac using the C4580, you'll need install the HP printer driver that you can download from www.hp.com
I hope this helps.
Regards / Jim B / Wireless Enthusiasts
( While I'm an embedded wireless systems engineer at work, on this forum I do not represent my former employer, Hewlett-Packard, or my current employer, Microsoft )
+ Click the White Kudos star on the left as a way to say "thank you" for helpful posts.

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look at this article
http://www.skyuser.co.uk/tutorials/sagem_fast_2504_how_to_change_the_wireless_ch annel.html
the point is not how to change chanel , i guess you know how to do this
but in step 4 the screen shoot show red line too add computer / ps3 - setup access list
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go to system preferences -> network -> select aiport port on left side -> click advanced button -> click ethernet tab
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now , insert into router list the Ethernet ID
HTH
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Don't pay any attention to anything you see here or on the rest of the Internet, especially when it concerns Apple. What looks like "a ton" is really only a handful of people. And you have no idea what they have done to their machines. There are several million other people who have no problem at all or are smart enough to diagnose a hardware problem on their own and take it in to Apple.
What you have already done in this thread is much, much better information than the average "me too" post you will find. No one posts diagnostics. No one makes an attempt to diagnose the problem. No one make an appointment to have Apple look at the machine. I've seen it over and over again. They just want to rant.
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C4850 and iMac wireless problems.

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