You might check the remote control, I have found a button stuck down slightly under the shell (case) and was holding a button down, constantly sendind an infrared signal. take the remote out of the room and them try the power button on the set again.
remove you're finger from the power button and stand back.
No. Do what your mother said, and stand up straight!
By pressing the power button on the back
There are so many animals that can stand straight up. Some of them include dogs, cats, monkeys, kangaroos and so many others.
Plug in cable for power, press power button, remove battery, press power button again, remove power cable, press power button a few times 3+, put power cable back in, put battery back in, try turning on. If that does not work then you might have to take it in for repairs.
stand up straight with shoulders held back
The power button.
Probably because your back is in the sitting position, and it gets stiff, then when you stand up, your back is transitioning into another position.
Sitting up straight and not slouching helps. Also when you stand put your shoulders back,chin up and your back straight. Exercise helps too.
A back bone allows an human to stand up straight. - the position or stance taken for a fight. If you say someone "has no back bone" it means they are not willing to stand up for themselves.
hold the stand by button and the home menu button until the screen goes black and then starts back up again.
When that happens to me. I simply wait for it to finish hibernating and then I hit the power button. Press the power button and it should come back up.