On average, about 5-10 mintues after I turn on my TV, there is a thin line that goes from bottom to top of the screen repeatedly. If I turn it off for a while, and turn it back on, the line usually isn't there under about 5 minutes afterward. It's very annoying when watching movies and such. My TV is about 3 years old now, so I don't know if its a problem with the TV itself or not. I have a cable cord hooked up to it in the back, and a video hook-up in front that connects it to my hometheater. Any suggestions on how to fix this, ASAP? Thank you.