Television and Home Theater

I recently moved and the movers lost the power cord to my LG plasma screen TV.  The end that goes into the TV is different than any I have seen before.  It has three holes like a more common one.  However, the opening is smaller.  It almost looks like some kind of computer connection.  However, LG doesnt' seem to know what I am talking about when I try to get them to send me a replacement.  They keep sending the more common three prong power cord.  Does anyone know what kind of power cord I am talking about and how I can obtain one?

I have a RCA 50" DLP Scenium I've had since 12/07/2005 and let me tell you it's been one of the best tv's ever.  The picture quality and sound cannot be beat for the price I paid.  I've replaced the bulb twice and just after replacing it the second time, my wife and I were sitting watching one night and it just went off.  The lights on the front blink on and off approximately every five minutes and that's all it will do.  No sound, no picture, no nothing.  I unplugged it, waited a while, then plugged it back in but nothing would happen other than the lights in

I have Toshiba TV model #32A30 that is only about 5 years old and I am having some problems viewing the picture.  It started about three months ago and when we turned it on the picture would not fill the whole screem.  Little by little the picture would shrink and finally it would only be a straight horizontal white line.  We would hit the top of the tv set and the picture would re-appear.  Next time we would turn it on it would do the same thing.  Now the line does not go away.  All I see is a straight line and the sound is perfect.  I am a handy man