The other day I noticed that my Samsung 50" plasma had a horizontal black line about 8 inches above the bottom of the screen. It hadn't been there a few hours prior. After making sure the problem didn't come from the cable, I checked my DVD player and Wii system - all had the line which meant it was the television. My TV was purchased in 2008, but fortunately, I'd bought a 5-year extended warranty on the 50" and the 42" purchased at the same time. Trust me, I did not want to pay that extra $399 for the 50" and $199 for the 42"!!! I called the warranty company which sent out a tech the next day. He took one look at the TV and said that the whole unit inside the casing would have to be replaced. The TV had to be taken in for service. The tech also said that often it was easier to replace the television altogether because changing out the inside unit was the same as getting a brand new product. I still have another 10 months on my warranties so I hope my 42" gets the black soon since this defect is common with plasma televisions, especially 50" and up. It can happen as soon as 2 months after purchase. Plasmas have a better picture and truer color that LCDs and LEDs but aren't as sturdy. I guess I'm lucky that it took 4+ years before it happened to me especially since my televisions were bought in Atlanta and, a year later, moved with me to Phoenix on a commercial moving van. I invested $200 for 2 packing boxes made for flat screens to insure they would survive the trip. I wouldn't have been upset if I didn't have the warranty since I can buy a new 50" now for 1/2 of what I paid in 2008.