Problems auto-connecting after sleep & startup (Changed from WPA to WEP)

Okay, I know there have been several issues similar to this, but after two days of sifting through posts, I still can't resolve this.
A few days ago I switched my AirPort network security from WPA to WEP-128. This was required to allow my Nintendo DS to connect to the netwrok, by the way. After the change, two similar, but slightly different problems started:
My 15" PowerBook G4 no longer auto-connects to the network at startup. The network is listed in the drop-down, and connects with no problem when I choose it manually. The computer seems to have no problem re-connecting after waking from sleep, which is odd because...
My other PowerBook, a 12" G4, won't auto-connect at startup AND won't re-connect after sleep. As above, it has no problem connecting using the Keychain once the network is selected from the drop-down.
So far I have tried, on both machines:
- trashing the system airport prefs
- deleting and resetting the network's keychain entry
- repairing the keychain (no errors found)
- turning off some unneeded power mgt options
- disconnecting USB peripherals
I have also reloaded the software on both my AirPort Extreme base and my AirPort Express hub, as well as restarting both hubs. I've also made sure that AirPort is at the top of the network connection list.
Both laptops are running 10.4.3 and have all the latest software updates installed.
What am I missing?
Thanks.

Both of these replies are helpful, in that they help confirm something I figured out this morning, almost accidentally.
One thing I didn't mention was that during the change from WPA to WEP I changed the network password. Now, I assumed that since the Keychain seemed to be working and I could get on the network manually without needing to enter the password each time, that meant the new password had correctly propagated throughout the system.
So, this morning I go into the Network settings, switch from Automatic to Preferred, select my network, look at the properties, and notice that somehow it has way too many bullets for that to be the correct password. I re-entered the password and that seems to have solved the problem. The new password I had entered somehow didn't make it into this setting. I guess trashing the network prefs, or renaming the network would have had the same effect.

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=============================================
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Message was edited by: 2point5

I have problems with activation, after delete mi Iphone from Icloud.

I have problems with activation, after delete mi Iphone from Icloud.

Hello Sikiz 21,
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http://support.apple.com/kb/TS3424
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Upon returning from the MacStore the sleep issue was still a problem and having read this post, I played around with my bluetooth and found that after sleep it started to reconnect again intermittently in either Off, On (not discoverable) and On (Discoverable). I then by chance realised my wireless keyboard was in the cupboard close by. I turned it off and reconnected it and it seems to have cured my problem. I have yet to try with keyboard on but in the past when it has been in permanent use I have never had an issue. So try resetting your bluetooth and your mice and keyboard and doing a full reconnect.
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I've rebuilt my keychain.
I've rebuilt the WEP password
I've changed my computer name to be one word no spaces.
I need help! My wife cannot use this computer if it won't connect without interaction. I never had this issue before 10.4.2 was installed.

Henry,
Thank your for the helpful link.
I created a new location based on the info in the link you provided.
It worked.
Now, the iMac G5 rejoins the network automatically after sleep or restart.
I don't know if level 4's need point, you and Frank C. (author of the info at http://discussions.info.apple.com/webx/.68ae4ead) just got some more from me.
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hello all ,
macbookpro mid 2009 osx 10.6.4, windows 7
having this prob since the first day i got my mac .
it sim that after sleep the smb connection dropped and only hard reset will solve the prob .
ive been in many forums and this issue sim to be very popular .
im very disspointed that apple dont have any mail service for applecare users .
anyway i hope some experts will read this msg and post up agood answer .
thx in advance
moshelog

I was having the same problem but think I have found a solution. So far I have put my Macbook to sleep about 6 times and I can still reconnect to my network servers.
I found the solution here: http://forums.macrumors.com/showthread.php?t=518958
Here it is:
1. Open network preferences from your WiFi icon in the menu bar. Then click advanced. Delete the network that is giving you problems.
2. Open Keychain in the utilities folder of your hard drive. Find the passwords that are stored for your particular network and delete them. There may be multiple passwords for your network, so search carefully.
3. Repair permissions using the disk utility.
4. Reboot the computer.
5. Reenter your network data to log into the network.
Good luck!

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Hi guys,
I keep having issues waking up from sleep with my T440s. It WILL NOT connect to wifi and the wireless adapter under windows adapter settings disappears. Only thing that fixes this is a reboot. I have removed "allow windows to turn this device off" under wireless settings.
Driver: 17.12.0.4
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Software: Lenovo Access Connections
I do not use windows to connect to WIFI. I have dedicated profiles for each of my wifi networks at home and work.
This is a serious productivity killer.
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Thanks!
Solved!
Go to Solution.

This is a well-known issue with the AC card. Go take a look at the Intel forum.
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Driver updating is way oversold here and elsewhere. If you're determined to update anyway, at least don't be an early adopter. Let other peeps do it first and then come back here and see about the complaints! Also, you can download the driver at Intel in their Administrators sets of drivers. Bare drivers and no software overhead.
Good luck.

Problems auto-connecting after sleep & startup (Changed from WPA to WEP)

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