AP Extreme only letting on one computer at a time

My wife recently got a MacBook instead of her old HP laptop, and we got the AP Extreme base station so we could share our laser printer. However, I have yet to be able to have both computers on the network at once. If one is online, the other one can't load any sites. I'm assuming it's got something to do with me cocking up the DHCP settings.
Cable modem: RCA DCM425
Macbook 1 is 4 years old, running 10.4.7. (Currently online).
Macbook 2 is 4 weeks old, running 10.6.4. (Currently not online, though that's the one that's got the Airport utility to control the base station; ethernet cable is plugged into the base station).
Also connected to the network is a TiVo - it's recognizing the network but not getting online successfully.
When I set up the base station, if I try to have it get ipv4 info via DHCP, nothing works. If I put in an IP address, subnet mask, and router address manually, I get the current fiasco. I strongly suspect this is the source of my problems, but am in wAAAAy above my paygrade on these things. Any suggestions?
This morning, I unplugged everything and let it sit for a half-hour, then plugged everything back in. This had the salutary effect of making my computer, rather than my wife's, be the one that's got the live connection.
P.S. Less likely cause of problems that I'll mention for full disclosure - I named the new wireless network the same thing as my old network was called. Old Linksys router is currently sitting on the floor, not plugged in (power or network), so I don't think that's it.
Thank you in advance to anyone who takes the time to write back!

When only one computer can gain Internet access is typically a symptom that the router is either not "recognized" by the modem or that it is not properly configured to share the Public IP address provided it by your ISP.
At this point, I would recommend a "factory default" reset on the AEBSn to get it back to its "out-of-the-box" configuration to see if this will get the communications working properly again. If it does, we can go over the set up steps to meet any of your networking requirements. Once reset, the AEBSn will be providing basic Internet routing capability and provide an unsecured wireless network with a name like: Apple Network NNNNNN.

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Airport Extreme only connects to one computer at a time

We just got a new modem and now we can no longer go online with more than one wireless computer at a time, although we have set up a network and it has always worked just fine with the previous modem.
The error message we are getting on a Mac trying to connect while another Mac is online is: (orange light) "Airport is connected to the network...does not have an IP address, cannot connect to the internet".
Another message says that the IP address is already in use by the other computer, so no access.
How do we get more than one Mac to go online at the same time, when there is this IP address problem?

The modem is a Zyxell/Zyzell/Zycell (spelling subject to change!) P600R-D1, our provider is Earthlink (formerly Mindspring). I honestly have no idea if it's a combination router/modem, I don't recall if I was the one who set it up or not as it's been several years.
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I'll try poking around the modem configuration page and see what I can find out about it, and I appreciate your help thus far! Hopefully I can get this resolved and cure this headache!

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<Edited By Host>

Re: That garbage is unreadable.
If you really want help, stop messing with the fonts and post so that others can read and offer suggestions.
Or better yet... try a search, I'm certain you'll find a solution to whatever issue you're experiencing.
I have found that many times it is the things that make you most angry that push you to action. This was the case here. Thank you for causing me to get so angry that I found the answer myself.

The computer that I had my iphone apps synced to has died and I don't know how to get access to my apps on the new computer. I'm using a Windows pc. I understand that I can only have my apps synced to one computer at a time, but the former pc is dead.

My HP Touchsmart died the other day. My husband works on computers as a hobby and was able to get me up and running on a Dell laptop in no time. I have an iPhone 4s and had all my apps on itunes on my HP. I understand that you can only have your iPhone apps synced to one computer at a time, but what do you do when the computer containing all your info is in unusable condition? I have tried deauthorizing all the computers associated with my account, that did not work. I had this problem once before and finally ( after much blood sweat and tears ) was able to deauthorize the old computer, but it was in working order. Two of the computers that are listed under the iTunes Wi-Fi Sync setting are no longer in use, the HP had my apps synced to it and the other had everything else except my photos, which are on a third computer that is still in use. Please forgive for information overload but am trying to give all the info that I think could be relevant. Your help would be appreciated so much!
Sincerely,
PiPI

Re: That garbage is unreadable.
If you really want help, stop messing with the fonts and post so that others can read and offer suggestions.
Or better yet... try a search, I'm certain you'll find a solution to whatever issue you're experiencing.
I have found that many times it is the things that make you most angry that push you to action. This was the case here. Thank you for causing me to get so angry that I found the answer myself.

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iTunes Store: Transferring purchases from your iOS device or iPod to a computer
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My airport extreme only will connect with computer or ipad not both

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We need just a bit more information, please before we can begin to accurately troubleshoot this issue.
1) What is the make and model number of your modem?
2) What operating system are you using on the MacBook Pro at this time. Your tagline indicates that you are using OS X (10.4.8), but this is about 6-7 years out of date.
If you are no sure which operating system your Mac is using......click the Apple icon in the upper left corner of the screen, then click About This Mac. Post back with the OS X Version number that you see there.

Ipod does not recognize that it is only synced to one computer

After connecting my ipod (classic 80gb) to itunes to transfer some music and
charge battery, this appears on the screen "This ipod is snyced to another itunes library. An ipod can be syced with only one itunes library at a time. What would you like to do?" It is only synced to one computer.
What adjustments do I have to perform to make it work like it should?
This is my first experience with an ipod. Any help would be greatly appreciated. Thanks

This is the *Mac OS X Technologies > iSync* forum, you should ask in one of the Windows iPod & iTunes forums.
Using iTunes for Windows
or see here: http://support.apple.com/kb/HT1202

File open on more than one computer at a time

I maintain a network of four Macs (Cube, G4 Tower, Mini, and G5 Tower) all running OS 10.4.11. Recently two people working on the network discovered that they both had a certain file open at the same time. In order to determine the extent of the problem, on each computer I created and kept open a TextEdit file. I then attempted to open each TextEdit file from the three computers on which the file was not stored. To my dismay I received no error or warning message of any sort. I was able to open all four files on all four computers at the same time!
Each of the computers has a single user, and each computer is logged into the other computers as the user on that computer (i.e., each guest is logged in as the host). I wonder if that might be the source of the trouble.
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This is absolutely standard behavior and I don't expect this to change any time soon.
Let me try to explain based on a model of a file stored on Server1 and being accessed by Client1 and Client2:
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Client1 connects to the server and opens the file for reading.
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Client2 reads the file and closes it
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There's nothing on the server that knows whether Client1 opened the file to look at it, to copy it, to back it up to some other media or to actually edit it. It is only that last step that should prevent another client from opening the file.
If you think about it, that makes perfect sense. If you copy the file over the network to Client1 you do not want the server to think that Client1 has an exclusive hold on that file and to prevent Client2 from opening it.
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Copy the movie from the current library to the correct library.
iDevices can only sync to one library at a time.

AP Extreme only letting on one computer at a time

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