I have a Dell Latitude E7470 (Service Tag: FLL4GC2) that is periodically black screening and freezing. Does not appear to be from movement of the screen or laptop nor software related. Just spontaneous. Starts with lines going across the screen and the computer freezing with the audio glitching out. Requires hard reset for functionality to return. I am guessing it is a loose ribbon cable, motherboard issue, or problem with Windows and/or drivers. Any other ideas or suggestions for narrowing down the problem.