I am not prepared to think that Sci Fi theories about Hal type computers or SkyNet (Terminator) takeovers are in the realm of possibility.
Self awareness is not understood and cannot be created, machines are machines, and current levels of computer engineering cannot duplicate the brain. To duplicate my brain, for example, as small and puny and limited as it is, would be impossible even with a building full of hardware and air conditioners as big as 18 wheelers.
Neuroscientists and computer designers can’t make a brain–but they could program computers to do bad things–easy enough.
The Borg are my favorite bad guys–you will be assimilated–but a movie about hybrid mechanical, thinking, self aware, collectives computers or computer networks is not in the realm of reality.