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TV staff were still working despite the shutdown
Many of Greece's public services are in disarray because of a general strike in protest at the government's surprise move to shut down state broadcaster ERT with the loss of nearly 2,700 jobs.
The 24-hour strike, which includes Greek media, began at midnight (21:00 GMT).
Marches under way in Athens are due to converge outside ERT's offices.
Prime Minister Antonis Samaras insists ERT was a "symbol of waste and lack of transparency".
The measure is designed to help Greece meet its debt bailout obligations.
The resulting general strike, which is the third this year, is affecting government offices, schools and hospitals.
Public transport hitIt also means buses, trams, ferries and trains are not running, with no metro service to Athens' main airport.
Air traffic controllers are due to stage a two-hour walk-out starting at 1200 GMT.
ERT journalists are staging defiant sit-ins in the capital and in Greece's second city, Thessaloniki.
The government says riot police are stationed outside ERT offices to prevent "any destruction".
Analysis
In a country notoriously slow at institutional reform, the fact that the national broadcaster was unexpectedly shut down within a day has stunned and angered many. ERT had been woven into Greece's identity during its 75 years of operations, its services announcing some of the most turbulent times: the Nazi invasion in 1941, the military coup of 1967 and now Greece's profound economic crisis.
The prime minister insists ERT is wasteful and inefficient. Its mismanagement is well known but employees say that is the fault of successive governments that brought in political appointees and got rich on corrupt practice.
This has now plunged Greece into a political crisis. Two coalition parties say they will resist the closure. There is talk of fresh elections, although the prime minister is banking on the fact that his coalition partners have minimal support and a new poll would be suicide for them. Greece's recent veneer of calm has been broken by this drastic move as the oldest broadcast media here is silenced.
Most of the broadcaster's output has been taken off air since Tuesday, although shortwave radio and internet broadcasts continue.
Journalists across all media are also calling for an indefinite protest - excluding those ERT stations airing rogue broadcasts maintained by workers who have refused to leave their posts.
"This is a very important struggle that impacts on everybody, because the draft bill is not only about ERT, it's about thousands of other workers too because it's a green light for thousands of lay-offs in public organisations," Georgios Milionis of the communist-backed labour group, the All-Workers Militant Front, told Associated Press.
But there is little sign of private businesses joining the strike.
'No sympathy'City streets have been as full as usual with commuters and car traffic.
Supermarkets have been open for business and cafes serving customers as usual.
"The lowest ERT employee is making in a day what I'm making in a week, so why should I strike for them?" vegetable-seller Yannis Papailias told Reuters news agency in Athens.
"Hundreds of thousands of people have lost their jobs. Who protested for them?" asked waitress Maria Skylakou.
Unions representing about 2.5 million workers have repeatedly gone on strike in Greece since Europe's debt crisis erupted in late 2009, although action has been less frequent and more muted lately than last year when marches frequently turned violent.
Corruption and mismanagement are widely known to exist within ERT, a public company symptomatic of Greece's past mistakes, the BBC's Mark Lowen in Athens reports.
But employees maintain successive governments were responsible as they were in charge, our correspondent adds.
AngerThe government says ERT was a huge drain on public resources, and will reopen at a later date under a new format and with considerably fewer staff.
All 2,655 employees will be compensated and allowed to apply for jobs at the revamped organisation.
The announcement came after months of strikes by ERT employees in opposition to plans to restructure the broadcaster.
Athens has pledged to cut thousands of public-sector jobs as part of agreements under which it receives billions of euros in rescue loans from the European Union and International Monetary Fund.
ERT, which began broadcasting in 1938, is funded by a direct payment of 4.30 euros (£3.80; $6) added monthly to electricity bills.
It ran three domestic TV channels, four national radio stations, as well regional radio stations and an external service, Voice of Greece.
Greeks strike over media closure
http://www.bbc.co.uk/news/world-europe-22883236#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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