I have a Samsung LCD TV, Model LN40A550. I tried to power off the TV using the power button on the remote. After I pushed the button, the TV has no picture, but the light in the bottom center of the TV stays on. I tried unplugging the power cable and plugging it back in, but the TV will not turn off and I see no picture. When I plug the power cord back in, I can hear the startup melody, its on an endless cycle. The red power light indicator is continuously flashing. Has anyone had this problem? How did you fix it?