Obviously a second hand buy, in my thought.
Like Bad_Kitty said if it was new then it should of had a remote in the box.
So like he said, phone up the shop where you bought it from to resolve your problem.
The other thing is even if you did not have the remote the manual that came with the tv.
Should still tell you how to turn it on via the control buttons on the edge, or side of the flat screen, or the bottom edge of the tv screen.
So you have either not read it, or not bothered to.
Or don`t have a manual also.
And that to me would confirm it was a second hand buy or purchase.
And if it was.
I hope you got a warranty or guarantee receipt of
some kind to return it if faulty.
There is an old saying, if it`s too good for the...