Got my macbook here. Bought it 1.5 years ago. Out of warranty. Running on 10.5.8 Here's a pic. When i printscreen it, the white strip does not appear. Its present even when I'm using my mac. And additionally, It's only visible when the background isn't white or black. Also, its been happening on and off. It normally goes away if I've been carrying my macbook in my backpack and then open it up again (leads me to think maybe it is sensitive and may have been bonked on something while i was carrying it in my bag). However, this time, it hasn't gone away simply by rebooting it. Help!!