My iPhone disappears from my iTunes window -- cannot sync

I can't sync my iPhone. 
With iTunes launched, I plug in my (Gen 1) iPhone, and the "Gil's iPhone" line gets added to the left column of the iTunes window as usual, but then, after a few seconds, it goes away.  Meanwhile, my iPhone's screen goes to the green battery charge indicator for those same few seconds, then goes to black about the same time that my iPhone disappears from the iTunes window.  The "Sync" button never appears in the iTunes window.
I have tried:
Rebooting the computer
Power cycling the iPhone
Unplugging and replugging my iPhone (Each time, my iPhone appears in the iTunes window then goes away.)
Using the other USB port
Using a different USB - to - iPhone cable
I tried plugging my iPhone into my partner's computer -- it seems to work there.  "Gil's iPhone" appeared in the left column of his iTunes window and stayed there.  I could view my playlists by clicking on the disclosure triangle, but, of course, it could not sync.
I have not synced my iPhone in several weeks, although I keep it in its cradle for charging. 
I'd sure appreciate some suggestions to get my iTunes and my iPhone syncing again.
--Gil

Well, this problem seems to have stumped the experts.  I called Apple Support (so glad I got the extended AppleCare).  We expect to hear back from Engineering in a few days.
The process was so cool.  We downloaded two apps to run on my machine.  One (ARA, probably for "Apple Remote Access") allowed Daniel of Tier 2 to view my screens and point at things (but not click.)  The other (ACCD) captured logs and files about my machine while I went through the mechanical procedure to repoduce the error, which took about two minutes.  The files are compressed into two dmg files, so the enclosing folder is only 5MB.  Looking through the logs in those dmgs is very interesting.

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