We are about to find out. NO! Well THAT was pretty exciting anyway. T minus 0.00 showing on the clock, engines seemed to be fired up and then . . . shut down.
There is a possibility the launch could still go tonight IF they can figure out what happened soon enough, the launch window will close around 0100 UTC. — Just updated NO launch tonight.
A tweet by Elon Musk: @SpaceX Launch aborted on low thrust alarm. Rising oxygen temps due to hold for boat and helium bubble triggered alarm
Found the YouTube feed: