Did you call someone in your dream, only to have it ring endlessly without anyone to answer? Did your computer's hard drive crash while you were in the middle of writing a paper? While these are not particularly terrifying nightmares, to some, a crashed hard drive can be just as devastating as crashed car.
Malfunctions with technology, especially communicative technologies, may mean you are failing to reach out to someone on an emotional level. Have you lost touch with a good friend? Is there a disconnect or barrier forming between yourself and a loved one? If this is a common nightmare of yours, take the time to evaluate your relationships and identify key areas that need to be mended.