Hello, I have an Early 2008 Macbook Pro with Mac OS X 10.5.5. By the time I was running on 10.5.2 my Wi-Fi connection used to work perfectly, but when I updated to 10.5.3 I started to have so many problems with it that I even went back to 10.5.2 for a while. I remember posting a thread in a forum and people answered me that it was impossible for a software update to mess up my connection. I proved it by downgrading and gaining full connectivity back. I've also found hundreds of people who have been having the exact same problem, but it appears as if Apple just doesn't care enough to give a definitive solution. Instead, I've tried tons of other so-called solutions from other people, that have not done anything good for me. The problem is as follows: I can perfectly connect to my home network, but after 30 seconds- 2 minutes, my signal drops to just 1 bar (from full 4 bars) and I can no longer use it. To fix it, I have to disable my Airport card and then enable it back, to get another 30 seconds - 2 minutes. If I ever get to be connected for more than 2 minutes, my connection gets reaaaally slow (as slow that it can take me more than 5 minutes to download a 100 KB file). Anyway, I'm 100% sure this is a SOFTWARE issue since the same computer running on Windows and resting at the exact same place doesn't have a single problem connecting. Of course, it has nothing to do with my router configuration. It is completely, entirely, 100% a problem related to Mac OS X 10.5.3 and above. I love my computer in many ways, but this issue has been killing me bit by bit. What does a computer without a proper Internet connection work for? Then you can remotely understand my frustration. Please, if you have had the same problem post it here. Apple has to do something about this, because I can't believe I bought such a useless computer! Thanks.