Intermittent flickering lines across display (+more weird behavior)
My MacBook Pro 15" Unibody Mid 2009 is suddenly displaying strange artifacts across the display - flickering lines of color (seems like red is most common). When this happens if i flex the machine body i can usually get it to disappear. Running an external display works totally fine, even while lines are appearing on the built in display. Another strange symptom - while this is happening sometimes, when i am dragging a file in Finder, it refuses to release from 'dragging' - ie... the OS believes i still have the mouse button pressed down (whether using a trackpad or external mouse) and continues to do so until a restart or sometimes a force quit.
I suspect the display cable, though the most effective quick fix while this is happening is pressure on the bottom, middle of the case (which of course worries me).
I should add, tho it seems strange and might be circumstantial - this all started after installing mountain lion (from snow leopard) and the artifacts dont seem to happen when i am running in boot camp.
Anyone seen anything like this?
Thanks in advance!
Is this a good question?