The Camcorder will flash the DV IN message as soon as the i.LINK/Firewire cable is connected to the Camcorder.
If you are getting the DV IN message then it indicates that the Camcorder recognize the connection.
You can use any video capturing software like Windows Movie Maker to transfer the video from the Computer.
Refer this link for the instruction to transfer the video to the Computer using i.LINK cable.
http://www.kb.sony.com/selfservice/documentLink.do?externalId=C111893
If you are not getting the DV IN message as soon as the i.LINK cable is
connected with the Camcorder then the issue may be with either the
Camcorder or with the i.LINK cable.
Try resetting the Camcorder or try with different i.LINK cable. Locate
the RESET button behind the LCD screen of the Camcorder. (You will be
able to locate the RESET button by opening the LCD Screen. The
Camcorder should be switched ON when you reset the unit. Press the
RESET button using a sharp-pointed object).
NOTE: Resetting the Camcorder will reset the settings of the Camcorder
to the factory settings including date and time. It will not delete any
data saved in the Camcorder.
If the issue still persists after resetting the Camcorder and with
different i.LINK cable then your Camcorder requires service to resolve
the issue.
Good Luck!!!!!!!!!!!!!!!