Airport/Wirless card is less sensitive & less powerful?

I just bought an used 15" Aluminum 1.5/512mb powerbook to replace my 15" Titanium 550/768. Everything seems good except the wireless function. Places I used to get stable signal of the old machine, the new machine never seems to be stable. The loading time takes 3 times longer than the old one, sometimes even stop loading. The titanium one can browse the net with very low signal, but the new one CAN'T. A chinese website that I pay to get download, the old machine has no trouble displays and searches on it, but the new machine just give me "nothing find" message. I put the two machines next to each other to do all the testing at the same time; again, old one searches okay, chinese site pops out okay; but new one just never ending loading and with "nothing find" message. Can anyone tell me what is going on with the new machine? Since the machine is newer, wouldn't the wireless card be more sensitive and powerful? Please let me know how to fix it. Thanks.

First, welcome to the discussions.
There have been some reports in the older Powerbooks of loose Airport Extreme cards as well as Loose Antenna Connections.
In the Newer Powerbooks the Airport extreme cards are soldered in and that just leaves us with loose antenna wires.
http://docs.info.apple.com/article.html?artnum=108039
Cheers Don

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