I've been noticing a millisecond-long horizontal flicker on my screen while playing videos on youtube for a day or two. Yesterday it did it one more time and now it's on all the time. Here's a photo of it: http://i39.tinypic.com/25jxmh1.jpg note that this is one line written in black colour on a white background. I haven't dropped or hit it. It's out of warranty so I could open it if necessary. Any help would be appreciated.