[dnanian]

Hm. Does the drive show up as a possible startup option in the Startup Disk Preference Pane?

To help me figure this out, please send the log for the run (just start SD!, open the log window and copy/paste) into the support email address: I'd like to take a look. Include a System Profiler report at the same time -- to do so, run System Profiler, choose File > Save and save to the default (XML) format. Archive (ZIP) the result and attach it to the email.

Make sure the drive is attached when you do that, too.

Thanks.