"it's not connected to Internet as I have'nt set that up.................. it tells me I have no cconnection"
Scarcely surprising, unless you mean something different. Please clarify.
"It just turned off"
The set shut off completely ( no picture, no sound and just the standby light on)?
The set shut off completely ( no picture, no sound and not even the standby light on)?
The set stayed on but there was no picture or sound on all channels?
If the last one, the local transmitter may have dropped off the air. Happens to me occasionally.
Where on the planet are you? The make of TV suggests you are not UK based.