According to the Lloyds List website the cause of the loss of power to the vessel's switchboard is still undetermined, although power has been restored to the switchboard.

http://www.maritimeasia.net/ll/news/sector/index.htm?sectorCode=Towage

The Boston Herald appears to have spoken only of "suspected computer failure" - so we may be premature in saying it was a computer crash wot dun it.