When you get the symbol does the Internal HDD show up in the Data Storage menu? If so then the probability is that the drive is not properly connected or it is faulty.
MENU > Settings > System Data Storage.
The old Humax HDR-9200T use to do this sort of trick after the HDD was replaced with some non-Seagate drive that was close but not close enough to what it was expecting.
I'd request a replacement ASAP.
When you get the replacement check out Black Hole's list of things to check when getting a new or replacement unit.
See Commissioning an HDR-FOX (click)