List of solution proposals for the WiFi connectivity issue?

I have had my MacBook for two weeks now and have only been able to use my wireless network at the very first day where it actually worked. As the connection works perfect from my PC I'm sure that it is either my MacBook or Leopard that causes the problem.
The problem appears in three ways. Sometimes my mac just can't see the network, other times it is vissible on the network list but unable to get connected to it. The third way is the most common - It gets connection but there is no flow (sometimes there is flow for a few minutes other times I have very slow flow - almost like a 28.8 baud modem) and no connection to the USB disk attached to the network. The Airport Extreme base is a few meters from the MacBook so it definitely not caused by distance.
I have tried a lot of solution proposals but nothing that worked. Heres my list:
- Clean install of Leopard. That didn't help anything.
- Deleting com.apple.airport.preferences.plist from Library -> Preferences ->SystemConfiguration. No effect.
- Restarting in Safe Mode. No effect.
- Removing encryption and leaving the network open. No effect.
- Changing the network name. No effect.
- Chaning the locality name. No effect.
Not being able to connect to the network is a highly annoying bug so I'm considering to return my MacBook if there isn't an effective solution. But before I take it to the dealer I would like to hear some more solution proposals.
Anyone?

The fact it works under Boot Camp and not under Leopard, suggests a damaged file or preference in Leopard. Sometimes by deleting all the locations in the Network preferences, and reconfiguring your airport setup there you can fix the issue. Other times it may be some software damaging the preference or cache files for the network settings. Are you using any third party utility software?
How much space do you have free on how big a hard drive?

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    ~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~
    If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
     Cheers, Tom

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        •    Launch Settings app
        •    Tap on Wi-Fi
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    ~~~~~~~~~~~~~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~~~~~~~~~~~
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    WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
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    Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
    Some Wi-Fi losses may stem from a problematic interaction between Wi-Fi and cellular data connections. Numerous users have found that turning off Cellular Data in Settings gets their Wi-Fi working again.
    You may have many apps open which can possibly cause the slowdown and possibly the loss of wifi. In iOS 4-6 double tap your Home button & at the bottom of the screen you will see the icons of all open apps. Close those you are not using by pressing on an icon until all icons wiggle - then tap the minus sign. For iOS 7 users, there’s an easy way to see which apps are open in order to close them. By double-tapping the home button on your iPhone or iPad, the new multitasking feature in iOS 7 shows full page previews of all your open apps. Simply scroll horizontally to see all your apps, and close the apps with a simple flick towards the top of the screen.
    Wi-Fi or Bluetooth settings grayed out or dim
    http://support.apple.com/kb/TS1559
    ~~~~~~~~~~~~~~~
    If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
     Cheers, Tom

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