Similar issue here ...
I've been having odd battery behavior for a couple of weeks. Today my 600 went down completely, much like srj321's problem a couple posts up. I've got lines on the screen, looking a lot like "droppings" left behind by moving a rectangle around on. The lines are not completely fixed: they change color value from white to black and vice versa as the machine puts up various content, but in either case they obscure most of what should be visible. Like srj321, the touch screen appears to work correctly. I've done a hard reset, but it didn't clear this problem. Anyone else have any luck with this kind of issue?