My mid 2009 macbook pro has developed an annoying issue. It started intermittently a few months ago, after the thermal paste was replaced on the CPU. But it seems to be a more permanent problem now. Firstly, I have vertical shadows at the bottom of the display, see picture attached. But more annoyingly, it has developed a high pitched whiney noise. This noise changes in volume when I adjust the brightness and disappears when it is full brightness. Luckily this isn't my daily computer and gets used maybe a couple times a month, but it is still annoying as hell. I have been searching google for months with no luck finding the answers. Can anyone help?