Do I understand you to say that you mounted its ext2/3 filesystem on a Window's box? Did you remember to unmount it before disconnecting?
Well, now that's strange. By unmount you mean remove the drive letters in the ext2ifs control panel? I only unmounted it via the Windows "Safely remove hardware" feature and now the volumes are still detected on Windows (as fs-type linux, swap etc.) but no volume is readable on Windows, it's complaining that they weren't formatted. I just booted the LS up with the HDD, it still boots fine (atleast it looks that way) but Windows does no longer read the partitions. Guess I'll need a LiveCD to revive them?
I just performed a test using Wireshark with the LinkStation attached directly to my notebook. It's completely silent, there's no communication from it on the wire neither when it boots up nor afterwards.
I guess I'll download a LiveCD and try to take a look into the mentioned file and the apt-cache to see if I find a hint. The box was configured for a static IP, not DHCP. However a DHCP server is also available and would grant the same IP to the LS. I also verified that the cable is ok (and the link LED also shows that a link exists).