when i hook my powerbook up to my hp moniter, only the background shows up. no icons or windows, jst the background. whats wrong? oh and another thing. when plugged into the charger, and the computer on and display open, the battery symbol says its "calculating until full" for a while. but then when i close the lid, it turns orange right away. and shows "calculating until full" again when i open it, then takes a while until it starts charging. why is this so?