Sadly I will need to return this notebook. And since I bought it open box, it would cost me a more money to get a replacement as they have no more open box 1720's at my store. The display is going bad. Not only those faint horizontal lines, but the display was acting weird. It would dim and then snap back to the current brightness every second. And then there was some weird lines at the top of the screen. Only happened at 144hz, only happened when it was warmed up. But it was getting worse. Anyway, to all of you with a 1720, enjoy your laptop.