IMac connects via ethernet fine but iBook doesn't get the wifi connection

I'm not computer literate. I'm told this has to do with the airport sharing but it looks to me like the airport sharing has to do with reading OTHER wifi connections on my iMac. I don't need that. The iMac is connected to the internet just fine. My iBook and my iPhone don't get the wifi connection that it used to get and I can't figure out why not. Thanks in advance for any and all help.

Welcome to the Apple Discussions!
More information would be helpful. Your iMac is connected to your ISP's service with Ethernet? And you are sharing that internet connection for the iMac with other Apple devices from the iMac's AirPort card? Do I have that correct?
If so have you shared that internet connection according to Apple's protocol for doing so?
My Mac mini is connected to the internet by Ethernet cable to my ISP's gateway. I am sharing the Ethernet connection to two iPod Touches via AirPort from my Mac mini. This is how Apple says to configure a Mac to share the connection;
1. In Sys Prefs/Sharing highlight Internet Sharing (do not check the box)
2. Share the connection from: Ethernet (from the dropdown menu)
3. To computers using: AirPort (check the little box)
4. Press the button AirPort Options...
5. Name the Network
6. Use Automatic for the channel or assign a specific channel
7. Encrypt the network with one of the choices
8. For sharing with a non-Apple device; PC laptop, MP3 player, etc, you must use only a 5 alphanumeric character, 40-bit WEP password or only a 13 alphanumeric character 128-bit WEP password. That does not apply if you are setting up sharing for Apple devices only.
9. Press OK
10. Check the box for Internet Sharing
11. Answer any dialog boxes that pop up
Any other forms of configuring sharing the ethernet over AirPort ususally results in various issues.
Dah•veed

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Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
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iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
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Secondary DNS: 8.8.4.4
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I'm running 10.4.0 on a 1.33 GHz G4 iBook. Since buying the computer in 2005, I've been connecting to the internet in various locations via AirPort, though I have hooked my iBook up to ethernet connections in the past and had no problems.
Recently I moved to a university where I must connect via ethernet, as the wireless network doesn't extend to the areas where I do most of my work. I bought a new cable. Much of the time, my connection is fine. But frequently I am unable to connect to the internet at all via ethernet, and I've noticed that it's always after I've woken the computer up from sleep. I've tried various ridiculous "kick the car and maybe it will start" techniques like unplugging the cable at both ends and waiting, restarting five or six times in a row, etc., and it starts connecting eventually, but I have NO idea why or why not. When I check my network preferences, I get the message "Built-in Ethernet is currently active and has the IP address [xxx.xxx.x.xxx]. You are connected to the Internet via Built-In Ethernet." But I'm not. What's going on here?

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We have a small office network connected to an Efficient Networks DSL router that's managed by our isp. The router has 4 ports and a linksys 8 port switch is connected to one of those ports. Another D-Link wireless router/switch is connected to another port.
2 i-macs connect without problem via ethernet cable. They are set to DHCP and get 192.xx private addresses. Both run 10.4.5. Another older imac running 9.2.2. also has no problems.
I recently purchased a powerbook G4 and it will not connect via ethernet to the Efficient networks router. At first it was connected to the linksys, so decided to connect it direct to the Efficient Networks router. With DHCP, it acquires a 169. internet address which is self generated (i.e. no real connection). I tried to give it a static private address (talking to the isp provider). They could see the powerbook but saw all zero's (presumable mac address). By the way the Powerbook works perfectly at home connected via ethernet cable to a D-Link router connected to a cable modem so it's not a physical problem. I even checked the ethernet cable I used in the office with another computer - no problem.
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Tks

Tim,
Thanks for your help. Here's what I've done before reading your e-mail. The D-Link DI-524 wireless router is connected to the Effiicent Neworks DSL router as you mentioned. One ethernet port of the EFF.Net. router is connected to the WAN port of the DI-514.
Because I have a D-Link router at home which works flawlessly with my powerbook, I decided to connect the ethernet cable of the powerbook to the D-Link which has 4 ethernet ports. Lo and behold, the powerbook acquired a private ip address and connected to the LAN and internet!
When I connected the powerbook direct to the Efficient Networks router, it could not communicate. I believe that there must be some software incompatibility between the powerbook and the Efficient Networks router. By connecting to the D-Link, the D-Link assigned an ip address to the powerbook, and it could connect to the server, lan, etc..
Only problem is that I have a Brother network printer that cannot connect to the powerbook. My powerbook cannot find it on the network. Because there is a linksys switch connected to the efficient networks router's third ethernet port, maybe as you said, going through the D-Link via DHCP (when the Linksys is also acting as a DHCP server, might cause this type of problem. What do you think?
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So the imac G5 has no problem with the efficient networks router but the powerbook G4 hits a brick wall. The G4 likes the D-Link router. I am concerned (and I will have to check this) that if I turn off the dhcp server feature from the D-Link, that whatever software issue crops up between the powerbook and the Efficient Networks router, will rise up again, because the D-Link will act like a simple switch (just like my linksys switch), and we'll be back to square zero. In any case, no harm in trying. This may be the cause of the Powerbook not seeing that Brother printer (even though it sees another printer and other macs).
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I did see a message saying that my network settings had been changed by another application but don't know if this figures in the mix.
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http://discussions.apple.com/message.jspa?messageID=8185915#8185915
Here is more of the story:
http://discussions.apple.com/thread.jspa?threadID=1730909&tstart=0

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IMac connects via ethernet fine but iBook doesn't get the wifi connection

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