Macbook-to-network connection fiasco

I have a Linksys 2.4GHz 802.11b router that provides wireless internet access for multiple PCs throughout my house.
I recently bought my first apple computer, a shiny, new macbook. Its internet works fine at coffee houses and in other open networks, but it will not connect to my home network. I have tried every sort of troubleshooting for the last few days and nothing has helped at all. I've entered and reentered every WEP/WPA key for the network dozens of times with and without the dollar sign and quotation marks. Nothing works. I am going crazy. The whole process goes something like this...
I select the desired router and I enter the requested password. The little rainbow wheel kicks around for a bit and the response is always an unchanging and resolute "The was an error joining the airport network...".
I have no idea what to do. I've called the people who installed the router and they can't even conceive of the WEP/WPA password not working.
Is this just an unsolvable byproduct of that disastrous 2007-02 update that can't be fixed without switching off WPA and WEP on the router?
Any magical solution would be wonderful; I've been trying to solve this for 8+ hours and am extremely frustrated.
Macbook Mac OS X (10.4.9)
Macbook Mac OS X (10.4.9)

Can't help you much with a magical solution but let's try a logical one.
Have you checked to see if the router is using MAC address filtering? That's MAC as in Media Access Control. If it is, you need to enter the MacBook's Airport ID into the router via its setup screen. The Airport ID can be found in the Network section of System Preferences. Click Airport in the Show listbox.
If you are using WEP, try entering the 10 or 26 character hexadecimal passphrase instead of the password.
Power Mac G5 2GHz dual-core & 13" MacBook 2.0GHz Black Mac OS X (10.4.9)

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Hello BassoonPlayer,
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Wuz

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Back up all data before making any changes.
Step 1
Take all the applicable steps in this support article.
Step 2
If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. Continue if you find that Wi-Fi is faster with Bluetooth disabled.
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If the application called "Bluetooth Setup Assistant" is running, quit it.
Step 4
This step will erase all your settings in the Network preference pane. Make a note of them before you begin, and recreate them afterwards. It may be helpful to take screenshots of the preference pane.
Triple-click the line below on this page to select it:
/Library/Preferences/SystemConfiguration
Right-click or control-click the highlighted line and select
Services ▹ Reveal
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*If you don't see the contextual menu item, copy the selected text to the Clipboard (command-C). In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
Reset the System Management Controller.
Step 5
Make a "Genius" appointment at an Apple Store, or go to another authorized service center.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
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hi
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DIAGNOSTIC NOTE 3: I have also tried altering the router's settings (i have played around a_lot with this, trying every combination I could think of - e.g. staple down particular devices to particular ip addresses, use only 802.11g versus automatic b/g, etc) but that has made no difference either.
RANT:
The only thing that prevents these disconnections from occurring is to keep the iPod Touch's wireless switched off, which ***** because if I'm in the kitchen I can't have it switched on to monitor my email (yes, I've no life, i hang around waiting for emails), or if I go have a lie down and want to check out stuff on the net, or to browse the iTunes music store or whatever, then I know that my connecting my iPod Touch the computer will be disconnected.
This obviously *****, right? And a lot of people are having wireless problems with their MacBooks, right? And these problems seem to have been around for over a year, right?
So why hasn't Apple solved this problem yet? Or am I just being melodramatic?
Your thoughts on any or all of the above, or flames if that's your preferred method of communicating, are invited. =)
Cheers
dr.colekat

Having the same problem here. As a first time mac user, Apple has certainly made a bad first impression.
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TS1398 Help! MacBook won't connect to the Internet on my network. Never had an issue on other networks, other devices work fine, i.e. iPhone/iPad. Says it's connected. Plugged in Ethernet and tried other browser. Called ISP and all good on their end.

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You can't change it - just try aagain.
https://discussions.apple.com/index.jspa
Where you find these options:
Notebooks
MacBook Pro
MacBook Air
iBook
MacBook
PowerBook

Macbook-to-network connection fiasco

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