I have a Philips LCD HDTV that I use primarily as a PC monitor (via HDMI) and occasionally with several video game consoles. Within the past couple of days I started noticing the screen will randomly flicker one or more white/yellow lines around either the top or the left side of the screen. I'd take a photo but the lines only appear for about a second and I can't really predict when they will happen. I was wondering if this is more likely a problem with my TV or my graphics card (an AMD Radeon 7750), and whether it is a sign that one of them is failing or if it will be fine if I just ignore it. Or if there's a way I can trace down exactly what the source is. If relevant, I've had the TV for around 3 years now and the graphics card just a bit longer than that; both were bought completely new at the time.