My iMac has had a reappearing yellow vertical line down the left of my screen for at least two months now, but like I said, it doesn't stay forever. What should I be doing to try and solve it? Does it at least mean the problem is somewhat fixable?
Maybe the video card. Try to spray with electronic contact cleaner the connections (pc cable to monitor).
SOURCE: Shortly after the warranty was
Although its possible for graphics processor failures to cause vertical lines, they more often create horizontal ones. The first culprit to check for a vertical line problem is the LVDS cable, which it turns out is not that expensive a part (not counting all the work there is in getting to it). To verify this, I would gently flex the cable while the iMac is open and operating, and see if the lines get better or worse. It may also be that the cable itself is fine and just a few of the connector pins at either end are intermittent, in which case it just needs reseating.
SOURCE: Colorful vertical lines on 17"
This is typically a bad or loose cable to the monitor inside the computer. While you can open the iMac, Apple doesn't make it easy. It requires special tools, and there is a lot of tape involved. You can go to an Apple store to get it fixed, or to most computer repair places. It will likely cost you a little more than doing it yourself, but if something gets messed up in the process, they will be on the hook for fixing it, while if you did it yourself, now you have two things to repair.
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