I turned on the MBP today (Mid-2007 Santa Rosa) and everything was going fine- until the screen started to jump! Literally the whole display bounces constantly, revealing a white line at the top of the screen (as if trying to center the screen or something). This is on the LCD- haven't tested it on a monitor yet... I just had my logic board replaced about 4 months ago for a faulty 8600GT chip- I'm so hoping it's not that. Any ideas?