Please see my thread on the Apple Support Forums at this link, particularly if you are using a unibody MacBook Pro and you're using an external display with it, with absolutely no problems driving the external display from your unibody MBP. Thanks in advance. NOTE: For those of you not aware, the new unibody MacBook Pro (and maybe the unibody MacBook, too) can have serious problems driving an external display. Currently, the exact cause doesn't seem to be known. I'm interested in determining whether or not exchanging units would be of any use in fixing the issues currently--if not, I'd rather not waste the time (and I'm sure that's true for others dealing with the same problem--a problem that seems to me to be more common than I imagined).