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I currently use a HP dv4-1224la and had a problem like this at one point, or at least as I recall it started this way. It only seemed to happen when the computer was warm, so could be the same problem. Eventually the monitor went what I thought was completely out and was in fear of replacing the whole thing. With a little research I have learned that at least for my model it is a faulty cable. If the problem comes back can you connect an external monitor and see if that external monitor has the same problem. The way I fix mine (don't have the skill to replace the cable myself) is very simple, basically a pinch/slight lift on the left side of the monitor. The other things I have heard is opening the screen more than 90° when turning it on or waking it up.
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