Hello, I just started my PC up and the resolution had changed to 1024x768, so I went to control panel to change that and the highest option was 1600x1200, which is odd because I usually have it at 1920x1080. This has happened once before but my brother fixed it by doing something in the Catalyst Control Centre, but he can't remember what he did. I have an AMD Radeon HD 6670 Graphics card if that helps.