My Sony RDR-HX725 dvd recorder has worked perfectly for 15 months but now on startup shows a message "HDD error" and will then not respond to any commands on the remote and the buttons on the casing. Only way to shut it off is by the mains plug. I've tried the disconnect from the mains and reconnect after a minute interval but no joy I would like to try setting it back to the factory default but can't access any screens to get into the System Menu. Has anyone had this problem? Can it be put by me or is it a Sony workshop job? Thanks in advance to anybody reading this.