My Mac Book Pro has faint horizontal yellow lines moving vertically. on the monitor.
My early 2011 MBP 15" has developed a phenomenon of faint, horizontal yellow lines, in clusters, flickering and seeming to move vertically. It is intermittent and cycles on and off with about 10-15 sec. on and 10-15 sec. off. It is faint enough that it is very hard to see except on a white screen, or a large white area. I first noticed it about a month or 6 weeks ago and it seems to be getting a little bit more noticeable. It is still faint enought, however, that I really don't notice it when I'm working. But it's not hard to observe if I stop and look at a white area for a little bit. I am not noticing any other abnormal behavior.
I have been very busy and kind of ignoring this problem. But a couple of days ago, I realized that I have only 15 days left on my 3 year Apple Care on this machine. At the present level, it SEEMS harmless enough, but I realize it could be a failing video card or video power supply, I suppose (it kind of has a flicker rate suggestive of 120 Hz AC).
I'm probably going to make a Genius Bar appt. in the next couple of days, but I just thought I would see what comments or suggestions this collectively very wise community might have. I am vaguely aware of comments about "hardware diagnostics" built into the Mac, but, if true, I don't know the details. Comments solicited!
MacBook Pro, Mac OS X (10.7.3)