Isn't that sort of hiccup par for the course at these sorts of events? I assume the best you can hope for is to handle them gracefully when they arise.
I was about to say. Stuff like this happens to the best of us. Look at any Apple press event and you'll see several machines lined up - and in fact, Jobs has had his hiccups as well during keynotes.
If this is regarded as a "fail", than the OP clearly has never held any serious presentation that involved hardware and software.
