Given he does what you recommend first Michael, I think he may not understand:
1. Must have iMovie 6 OPEN
2. Plus the camera must be ON
3. Plus camera must be in VCR mode.
4. Then Plug In The FireWire
5. In iMovie preferences AND the HC3 make sure the settings are coordinated with the settings Michael lists above. Nothing will work if they are not.
6. Make sure your iMovie MODE is switched to the camera position. That's the little slider that has a camera icon on the left and a pair of scissors icon on the right. Without that toggle switched to the left next to the camera icon communication is impossible (as the Japanese like to say).
7. In that mode you will see a blue screen with the words "Camera Attached" in white in the middle of it. Your time code will appear in the upper right corner. (If not you will see the words "No Camera Attached" with a button for "Connection Help" that will launch Apple's own help file including links to other pages that can help as well.)
7. Press play in iMovie and you will see the stream playing from the camera.
8. Press the "Import" button and it will begin to copy the stream to your Movie Folder.
I think the above stories of communication failure were related to not understanding these steps due to not reading the documentation Apple includes in the extensive help files you can choose from the menu in iMovie. There are also numerous iMovie books out there. You should definitely buy one of those to fully grasp the power of iMovie. It may appear to be simple and limited when in fact it is quite complex and powerful.
iMovie 6 & iDVD: The Missing Manual is 512 pages long.
iMovie HD 6 and iDVD 6 for Mac OS X: Visual QuickStart Guide is 312 pages.
You aren't going to figure out how to use all the Power of iMovie without one of these books.
The notion that it's Sony's fault their DV or HDV camera's won't work in iMovie is fundamentally false. It is
operator error or obsolete versions of iMovie that don't support HDV which are the crux of the problems described above not Sony and not Apple.
BTW FYI: Have you visited
our HDR-HC7 thread yet? Lot of information is there that can be applied to any HDV camera.