OK, good we are getting closer.
On the digital back the number of pictures does not appear, but only 6,9k.
k=kilo=Thusand, so what it says is you have room for 6900 images which will be your computer when there is no CF cards that can take that many images.
Also you should have is a firewire symbol in the bottom of the screen.
If computer keeps telling you that you have a transfer error but you can shoot fine to your old computer then you probably simply is not using a firewire card that is fully firewire compliant.
We recommend the Orange Micro cards or Belkin.
I suggest you contact your local Phase One dealer when they can help you out quicker then we can here on the forum.
http://www.phaseone.com/Global/Dealers/ ... urope.aspx