Summary: Purchased TV from Electronics Expo after researching LCD's for 3 months driving around and looking at the Sony XBR6, Samsung LN52A650 & 750, and Sharp Aquos. After ordering, it was delivered in a week on a Wednesday. That Saturday we unpacked it and installed it on a new TV stand, and within 5 minutes of turning it on, a "Humm" started. I changed outlets, satellite connections, surge strips but the "Humm" would not go away. It is so annoying, I cannot watch the TV.