Having turned on my G4 today I've noticed that the display has gone weird on me. It appears that the desktop is slightly too big for the screen and when I move the cursor the desktop moves. Hard to explain without seeing it, but imagine I put the cursor in the top right corner of the screen, the bottom left of the screen disappears and vice versa. As I move the cursor around the screen, the desktop moves very slightly to compensate all the time. It's incredibly annoying and I can't find a solution, or a reason why it's happening. Can anybody offer any advice?