I have a Macbook Pro 13" from 2011, with Intel Core i5 and HD3000 graphics. Since a week ago, the screen has a color tint. First it was green, now bluish. Red is rendered as gray-black, and blue, intermittent horizontal lines are displayed most of the time, especially when I change the screen orientation. Random artifacts are displayed as well. This problem appeared without apparent reason, once I took my macbook (which was in standby mode) out of my suitcase after a travel. Displaying stuff on an external monitor works just fine. Should I change the logical board/display cable?