Have you tried it on another PC. This is to rule out a bad monitor. If it works OK on another computer you are looking at issues with your computer.
First it started out as lines going vertically throughout my monitor, and I didn’t think much of it so I ignored it. Then later on the problem began to escalate, and my monitor became black and white, staticky, and shaking with more lines going both vertically and horizontally. Now whenever I turn on my monitor, it just shows green and pink lines and slowly dims down into the monitor is completely black.