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Why is my pc scrolling going really weird (wavy/repaint effect)?

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the electric just went out, and when I turnt my pc on my screen was bigger than usual, however I managed to find an answer to that, but my mouse when I scroll is awful!!! I get some strange lines, after you scroll down the mouse will delay then it will VERY slowly start scrolling and if I scroll it lots my pc will start bleeping, as if I'm pressing lots of keys, PLEASE HELP ME IT'S DRIVING ME INSANE :'(