Oh geez, where to start. Short version: customer support with my ISP determined that my modem was not at fault. Customer support with Linksys determined that my wireless router (version WRT54G V5 with latest firmware 1.00.9) was the faulty product but after 1 and a half hours they couldn't fix it. My setup: One PC with a direct CAT6 connection to the router (this is the computer that i use for administrating the router since it is tethered). Modem and router are connected with the cable that came with the router. No error lights on either device. I have 2 apple 17" powerbook G4s trying to connect wirelessly via the router. I have tried WPA Personal, WPA2 Personal, and WEP. I could only get WEP to work in 128bit/26hex mode. I could not get WPA2 Personal to work. WPA Personal is what I have been using for a year. My problem: the router will not assign separate ip addresses to the apple powerbooks. one one computer i get an error message saying the ip is in use, and on the other powerbook it is working just fine at the moment. this is likely to change in the next hour. I know for a fact that the cables are working properly. The laptop with the ip address conflict just got back from the apple service center (they ended up replacing my computer with a brand new powerbook) so it is new. And it had this problem even before it went to the service center, in fact this was one reason why i sent it in. Another problem I have is that the wireless internet goes out intermittently for no reason, but the cabled internet with my PC always works... Help please!