I fired it up again and got some more info. In addition to the occasional 'wobble' (which seems to happen when there's a lot of hard drive activity or when windows or apps are opened) there are two very distinct 'interference lines' go across the top (right above the HD icon) and bottom (through the trash can) of the screen. There are other bits of interference, but these two lines are the biggest and are permanent. You can see them in this picture (sorry for the crappy shot):



Does this sound like a cap issue or something else that's going wrong. I'm 99% sure it's the caps, but I want to make sure before I spend money to have it fixed.