I bought a 1TB MY Book World Edition about 3 months ago. Setup using basic setup & Mionet (free version) and copied about 750GB onto it. I haven't really used it since just occasionly looking at some files on it.
However a couple of weeks ago I turned it on and now all I get is the front light flashing about every second. It wont respond to pressing the front button (so wont power off) or the reset button. I notice that the lan port also flashes in unison with the front light.
This happens regradless of whether it is plugged into my router or just has power attached.