^ precisely. you need to do this: right click on your desktop and go to properties and click okn the "settings" tab. from there click the advanced button. under the monitor tab you can adjust your refresh rate. play with it a bit(especially if its not set on optimize). you could be able to get rid of the lines(assuming that problem is not being caused by the possibly failing power supply unit)
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Then the screeching is probably something to do with the faulty monitor, the lines are probably a software/configeration problem. Are your drivers up to date?
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