I just bought a new iMac -stock config- and it cannot mount my 300 GB Maxtor One Touch External HD (yes it has its own power source). I had the same problem with my 2.33 MBP when I installed the 10.4.10 update and after several months of not having access to my external I found this thread which actually had a solution that worked and my external and MBP became happy friends again. I've tried the same thing on my iMac only to realize that it won't let me change any of the files because it's post 10.4.9. When that failed, I searched and found this idea http://www.macosxhints.com/article.php?story=20070628092633507 but it and everything else suggested doesn't work either. Frustrated I called Applecare, and after telling me to do the most obvious things which I started off doing (DiskUtility -pointless because it doesn't mount-, boot from install disk - pointless because it doesn't mount, etc.) and after 45 minutes of them saying "well, um, oh, let me ask my supervisor" they ended up telling me I'd have to take it to the Genius Bar. At the moment, my only solution is to share it through my MBP, but when the MBP is being used elsewhere, there is no way to do it. I'd rather just return my 2 day old iMac than hand over my external (which I know they will wipe because they'll blame it as the culprit of everything) and my iMac for a problem they won't be able to solve because I think this goes way over the Genius' heads. So with all that said, can anyone on this forum (madjew I want at least a funny reply) help before I return my iMac and never buy another Mac for the rest of my life. Thanks in advance.