The Greek Prime Minister, Antonis Samaras, faces crisis talks with coalition allies over his decision to shut down the national broadcaster.
The conservative leader's junior partners in government were furious about the sudden decision last week.
Mr Samaras accused ERT of corruption and waste, as the country struggles to pay its huge debts.
Greece's top appeals court is also meeting to rule on whether or not the closure was legal.
ERT's screens have gone from black to showing colour bars and the name of the new-look broadcaster proposed by the government, Nerit, now features in channel searches.