[dekz]

Same thing happened to me around the same time. I went in reporting failures and not being able to boot into it or find it with liveboot. Genius recommended a reformat which somehow installed (but didn't really work, console all also reported failures).

Second visit ended up replacing the hdd with a new one. Just did this update and my Mac isn't doing so well. user land can't load. Beware.

EDIT: Eventually it came to life, my model is TS064E which is apparently one of the effected models, so it looks like a third Genius appointment for me.