Yep, I saw a lot of talk about the needing-formatting issue on the various boards intermixed with the no data connection issue. They seem to be quite unrelated though, and easy to distinguish (with my issue, the 705 would not go into 'connected to computer' mode, and would remain fully operational - the man at Garmin blamed this on broken connector i.e. physical defect).
When formatting the Garmin, could you not remove the SD card from the unit first?
I was annoyed to find out you can't backup the SD card -- it's incredibly easy to loose. Also, only after purchase did I find that only the DVD version allows you to unlock full mapping in Garmin Connect Garmin Training Center (EDIT), the download and SD card versions don't allow this.