Is there still no good way to keep using Time Machine after a logic board replacement, without having to erase everything and start Time Machine from scratch? I was looking through the forums and found this article, http://www.macosxhints.com/article.php?story=20080128003716101 which describes how to replace your new MAC address with your old one, so that Time Machine can just resume where it left off. However, after following the instructions I'm still having troubles finding my old MAC address through Terminal. I noticed that this article (and all other posts about this subject I found) is pretty old, so maybe it's outdated and the process doesn't work anymore. Has anyone else found a way to keep backing up through TM after getting a new logic board??