My Tv Samsung Don't want to turn on

I Tryed To Use ST With My Samsung Tv 7 series (55) And When I Clicker On The Button OF turning off the tv He Turned off But When I Want to Turned It On He Dosn t work With ST also With the remote controle ( HG )
Some Tume He Is Shows Me Samsung Powred By tizen
And He Turned Off
Please I Need help
P.s: In ST He Shows Me That The Tv Is Offline And I Can’t Toutch AnyTHING Also when I Clicked The First Time Of The Power Of Button In ST And I Wanted To Turned Back On He Didn’t work
Please Halp Me