I have Sony DCR-TRV890E camera.
(it has enabled dv-in via upgrade)

When I connect the camera via firewire to the PC, the PC hangs.

I checked with a Sony, they say its a "IC" which has gone wrong.

DAMN! Fixing this cost a lot of money, about $310..

So a leason to be learned!!!

ALWAYS POWER OFF ALL EQUIPMENT BEFORE CONNECTING FIREWIRE CABLES!