Redundant as it may sound, check the connections at both the outlet, and at the point where the cord plugs into the TV. Also, if you're using a breaker strip, check to see that you didn't pop the breaker.

Outside of that, try unplugging it for an hour and then plugging it back in. If there's no movement, it may be a power supply issue, but at that point, I'd recommend having a technician inspect your unit.