There was a movie that I saw as a young kid, way to young in fact because it gave me nightmares for a month. It had to of come out in the early to mid 70's and revolved around the death of a young teenage boy and his mother grieving over his death. She was alone in a large and dark house during a nasty thunderstorm when her dead son shows up at the front door not remembering anything about his death. Naturauly she's overwhelmed and brings him in after wich he starts to act weird and then eventualy tries to kill her and after she falls down a flight of stairs he comes out of the dark with a demonic face. The details I can offer are that the house was pitch black except for patches of white light here and there, it over looked a rocky ocean front cliff.
I dont remember the name of the movie given that I saw it when I was 4 or 5 but it had only very minor special effects to the tune of fake lightning and thunder, rain and wind and the demon face. Everything else was all suspence created by delayes and music wich could be seen as special effects and sounds and good acting.