my ethernet connection keeps saying: built-in ethernet is currently active. built-in ethernet has a self-assigned ip address and may not be able to connect to the internet. it keeps assuming this 169.asdfasdf ip. for a few moments it'll go to the real 10.asdfasdf ip that it should, meaning it can connect to the net, but 99% of the time it has the 169.asdfa address. it is connected to a switch, but even if i plug the ethernet directly from the jac, it still does this. i even reformatted my powerbook and it is still doing this. my PC in the room, and roommate's laptops work fine when connected with their ethernet, what is going on!?