More details please. Have you cleaned inside with canned air, and renewed thermal paste on heatsinks?
I have a 970m gpu and an i7-4760 running on msi notebook. Recently I have started to notice horizontal screen tearing in my games and I've tried many ways to fix them but non have worked including vertical sync. I also recently found that there is a about 600px x 1000px of screen which stutters and tears when I watch netflix or play games. Am I missing something apparent or is the computer just getting old?