All television channels run by MediaWorks are now back on-air after a power fault took them out.
MediaWorks-operated channels Three and Bravo were showing no signal on screen.
MediaWorks has been contacted for comment, but in a tweet, the company said its Flower St studio had been hit by a power failure.
"Technicians are working on the issue and it is expected that the normal viewing schedule will resume as soon as possible."
This is the second time in recent weeks that MediaWorks broadcasting has been affected. There were also issues in February when a power outage stopped the 6pm news bulletin from being broadcast.