iBook wireless problem

I have an old iBook (OS X 10.4) that I cannot connect to a wireless network.
I have tried connecting it to 2 different wireless networks. Each time I get a message saying:
There was an error joining the AirPort network "mynetwork"
Each of these networks is password protected. I know the pw and am able to join these networks on my Macbook Pro with OS X 10.6.7

What can I do?

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Hm... 10.4 should support WPA. I assume the encryption is WPA. You can try to disable password and try to connect to the wireless network without password. So that would eliminate encryption issue.

Check network settings, make sure there is no static IP or DNS set. Computer should receive that information from the router.

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Make sure the iBook has ALL updates applied via software update, also if the machine has been on this network before go to the keychain and delete it's entry. Then try again

The problem could be hardware or a software related. So you need to be sure where the problem lies.
Have you tried reinstalling the drivers for the wireless card ?

To test that the wireless hardware is okie,  down load ubuntu 9.04 live CD ISO fro MACBook and burn it on to a CD. Boot your machine with the CD and test the wireless card. The program will run off the CD and will not write any thing into your hard drive.
You may have to connect to the internet with a wired connection first just in case the driver are not avialble on the live CD. Drivers can be updated very easy via the System>Adminstration>Hardware Drive update.

Good luck.
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allelopathAuthor Commented:
Password is WEP, not WPA. Does this matter?
I think you are referring to the encryption.

The encryption must follow what you have set on the wireless access point.
If the wireless access point use 40bit WEP then you should use the same type of encryption on the laptop.

allelopathAuthor Commented:
I have the iBook connected with an ethernet cable now.
When I try to update the OS, I get an error saying:
The digital signature for this package is incorrect. The package may have been tampered with or corrupted since being signed by Apple.

I also tried downloaded firefox, but I get "Verification failed"

allelopathAuthor Commented:
I've tried both of these twice now.
The OS update fails the same.
With firefox, I didn't get the verification error, but clicking on the dmg fle does nothing.
The error indicates that the OS on the machine has been corrupted.
Do you have the original OS disk. If yes, I would back up my data and
reinstall the OS.
Hopefully all will be OK.
You must get your OS software on a CD.
allelopathAuthor Commented:
I don't have 10.4 disks readily available.
I do have 10.6. Can I install this?
What is the full name of your Mac machine and the year it was made.
You may not be able to run 10.6 on the machine if its very old.
allelopathAuthor Commented:
PowerPC 750 (1.12)
1 Cpu
700 Mhz
640 mb ram

Not sure how to when it was made.
10.6 cant run on PowerPC.

There are hmm sites where you could download an image of the dvd. Could try to take it to apple store see if their excellent support will have one around since you already own the hardware.
If you talk to some mac users you may get the OS CD from them.
Chances of downloading the software are slim but you could try.
Apple should be able to assist but I reckon they will charge you for the CD.

Also, if you try to install the 10.6 it will just stop and not proceed.
Try putting a $ sign in front of the WEP key.
what does $ do in front of a WEP key???
allelopathAuthor Commented:
I think I can get a 10.4 disk.
The $ sign says to treat the WEP key as Hex, not Ascii:  http://support.apple.com/kb/ht1126
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