Also make sure your camcorder is set to VCR, VTR, or Play mode.
When you have your camcorder connected with a cable, but is prompted 'No Camera Attached', ensure your camera is powered on and re-connect your camcorder to your computer properly via a FireWire or USB cable. IMovie will detect whether a camcorder is connected. iMovie automatically detects your camcorder More Useful Tips for Importing or Transferring Video to Mac Tip 1.