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Run a full scan using your anti-virus program to see if it will track down anything, next go to www.download.com Type: malwarebytes anti-malware and run the program with a full scan, "free" this program find just about anything that is lerking in your computer. Now! if all this fails, do a complete fresh install of your operational system.
Some of the transistors or the connection to the panel inside the monitor are damaged. There is no absolute fix for this problem.
You can try pushing on the bezel (NOT ON THE SCREEN) of the monitor at the edge of the screen directly at the lines and you may be able to push the connection back together well enough that the line goes away, but usually in desktop monitors the bezel is too rigid to allow you to put any pressure on the connections at the back of the LCD panel.
When I turn on my computer the monitor takes a long time to warm up and colors change and vertical lines flash across the screen from right to left before the screen becomes normal again. Now the power light even goes out upon turning on my computer and I have to unplug the video cord and plug it back in to start the screen back up which even takes longer.
I know exactly what your talking about. I've seen in many times. It' happens too in CRT monitors as well as LCD. It could ALTHOUGH be as simple as a bad cable catching interference. Most likely though, it sounds like a bad LCD driver board or video board. If you have warranty, call it in. Otherwise see if it lessens with adjustments of contrast and brightness up and down. This directly affect the driver board power and can improve it enough to be tolerable again.
The screen you have is almost certainly on the way out. This type of fault is in the Horizontal Flyback section of the Monitor. Usually components fault or age and change value, these lines are normally "Turned Off" so ya can't see them, that "Turn Off" circuitry is going faulty.. it will only get worse. I suggest a new, or 2nd hand monitor as they are so cheap these days fixing CRT monitors can be cost prohibitive.