If my tv show a black screen and nothing els and nothing els what is whats the problem ?

Black Screen,
I think there are 4 possibilities for your problem. In order:
1. Is this a configuration issue with the set? Do you have the proper input selected? Did the grand-kids help you by re-configuring your set with random remote commands? Can you issue commands through the remote and get reasonable responses from the TV? A black screen could just be an incorrect signal source selected by the remote.
2. Does the set have power? i.e. does the little light on the set come on when you turn it on? Be sure to test the AC line power to make sure the breaker has not tripped. You will get nowhere without power. If the set has power, then;
3. Is there a video signal? Is the cable or satellite box (if you have one attached) Live? That is, does it's little light come on ? Again, gotta have power to work.
Cycling through the possible sources on the TV, one source should be over the air broadcast. Antenna or not, you should see snow on the screen when on this source, indicating that the set is trying to display something, it just has nothing to display. If you see snow, you can be pretty sure the set is working and you need to track down why there is no signal.
4. If you have power and signal, and you still have black on the screen, you may have an internal problem in the set. A good test would be to borrow a TV set from a friend and swap out your set. If your friend's set works, you have a TV problem. If it doesn't, your set is probably fine and you need to look elsewhere. Note that a working friend's set rules out problems everywhere except your TV set.
You should try to correlate when this problem started with external events. Did you have a lightning storm? Spilled a drink? Sit on the remote? What happened (if anything) just before the set quit working?
If you have a problem with the set, I am not qualified to advise you on the repair, nor should you attempt it. There are serious voltages present in all TV sets, and you could DIE!
Take the set to a qualified service tech. and have them repair it, or take the modern route and recycle it before buying a new replacement.