volume/green blinking light

the other night my TV (by itself) turned the volume up as loud as it could go. when we used the remote to try to turn it down that didn't work so we used the button on the front of TV.It turned it dow but as soon as we lifted our finger it was right by up as lound as it could go. we finally had to uplug it. Now when we plug it back in all we get is the green blinking light. Help