I have cable modem hooked up to my G5 and airport extreme. I also have a g4 powerbook w/ airport card and it connects to the internet effortlessly. I also have a PC (Dell) in the house with a Linkys wireless setup. At first, it took a while to get everything up and running on the PC--but then, after it worked for a while it went down and now I have no clue as to how I can get it working again. I need help because the PC was brought solely to use the internet and now it just sits there.