Please help. I have been trying to fix this for about 7 months. I first noticed this issue when I started traveling around the country, from hotel to hotel. While others (PC's and Mac's) had no trouble connecting to the free wifi at these hotels, I did. I kept getting "self-assigned i.p." This was extremely frustrating. I often had to call up the i.t. guys and ask them to help me manually put in ip address, subnet mask, router (gateway), and dns. This worked much of the time but not always. Let me also say that, sometimes it worked perfectly! I'd say about 25% of the time (at these hotels) my internet worked perfectly – just connected immediately. The other 75... "self-assigned i.p." I just spoke to the mac "geniuses" and they told me it's not an issue with my computer at all (either hardware or software). Are you kidding me?!?! How can they explain everyone else's internet working except mine. And I'm talking like 100 or more different hotels in a 4 month period. They were trying to tell me that it was just a coincidence every time! "You'd be surprised" one guy said. Hahaha. They said that the routers aren't accepting my computer's whatever. OK, well WHY?! The router works for everyone but me. It's something wrong with my computer right?! Well no one acknowledged this. More background info:Just had my airport card and logic board replaced. Computer came back and the sheet said "passed all hardware tests." BUT, none of my issues (I had other ones too involving battery life and not being able to access certain websites) were fixed. I went to an apple store. They told me to do an erase and reinstall or whatever. So I did that (by dragging and dropping everything I'd saved on an external hard drive using disk utility). By the way, I also upgraded from leopard to snow leopard. So now, if I have the same issues after this I'll know both leopard and snow leopard are screwed up.... right? OK, so I followed their instructions on deleting and reinstalling to a tee and guess what?! Everything worked! Or so it seemed. Battery fine. Websites now accessible. I figured the airport issue was fixed too. But now that I'm not touring anymore and the airport works in my house, I never encountered any issues. Until now. At my work. I got a new job and it's one in which I HAVE to have a computer that connects to the internet. So of course, the same issue with self assigned i.p. presents itself. Everyone else in the office has no problem. Including a Mac person that used to work there. I've been reading some other threads that are just completely confusing me. One of them might be the solution but I thought I'd detail my troubles so that some smart computer person out there can diagnose my specific problem and give me a specific fix. I noticed that many people believe there was a bug in one of the 10.5 updates. I am pretty quick to install updates (maybe I shouldn't be because I hear that the first updates are often buggy and maybe you should wait for a while). But this problem has continued now with Snow Leopard too so... I don't know. I don't know anything anymore. I have tried everything. And Apple is telling me it's not a problem with my computer. Give me a break. One more interesting quirk: before doing the erase and reinstall my computer could not find the Apple Store's network. After the erase and reinstall it works. That's why I assumed everything was fine! But no. And now the Mac people are saying there's no problem because they can't see it. BTW, I have tried all the obvious things. It's not an obvious thing. But I mean, if you think it is... then tell me I guess. But I've been in the advanced tab thousands of times. I feel like I've exhausted everything in there. Thank you thank you thank you in advance if someone is actually able to solve my issue.