Just received my copy of Planet Earth HD-DVD from Discovery.

  Problem appeard when it start played, my xbox 360 system freezed.

  I put my King Kong HD-DVD and make sure the problem come from the HD-DVD media source, however King Kong HD-DVD played just fine.

  After Google around a bit, and find out the problem maybe the firmware issues of my Xbox external HD-DVD drive.

Try below link for firmware update: http://www.xbox.com/en-US/hardware/x/xbox360hddvdplayer/download.htm#liveupdate Make sure either one of your Planet Earth HD-DVD disc is on the drive then go to Xbox live and chose play HD-DVD and it will automatically start the firmware update.