Recently, the display of my MacBook Pro (unfortunately, out of warranty) often is black/greyish after wake-up/start-up with a thin white stripe in the middle of the screen, and the computer (obviously) cannot be used in this mode (you can hear it start up, but since the screen is completely dark, I can't actually do anything - restarting doesn't help either). At first I thought it might be the graphic card (since there is a known problem with NVIDIA), but I've brought it in for repair where they have run multiple software-tests, and no error code was returned (when I brought it in it magically "fixed itself" and, once running, the problem can't be re-recreated), so nothing was fixed. It seems to me that the MacBook for some reason cannot find or communicate with the display because I just discovered that if I hook up an external monitor, it manages to find that, and, after disconnecting the external monitor again, also "reconnects" to its own display. It then generally runs fine until I physically move it (ie. put it in my backpack and carry it somewhere) - after being moved, it tends to have the same problem again (not always, but more and more often). Have you had any similar experience and/or any ideas of what might cause this and how it could be fixed? I'd like to avoid replacing the display or something of the sort until I know for sure what's going on. Thanks a lot!