In a storyline which completely misleads audiences about the nature of EVP (electronic voice phenomena), this EVP turns out to be not the voices/images of ghosts, but premonitory visions of situations Jonathan (Michael Keaton) can interfere with (e.g., he saves a baby, he consoles the granddaughter of a dead woman, he finds a missing soccer mom). Whether that's really Anna's (Chandra West) ghost on the video, instructing him where to go, is anybody's guess — this is a muddled mess of a movie.
In any case, Jonathan finally ends up back at the warehouse (he was there earlier, in the elevator, when the power cut out), where the missing woman is being held by the site worker he saw earlier when exiting the elevator. The worker is being controlled by three evil demon-things (the three shapes you keep seeing on the video, and at Jonathan's, after his apartment is trashed).
Now, I'll tell you the ending, but don't expect me to explain it for you, as it makes no sense whatsoever: Jonathan gets beaten up by one or more of the three demon-things. The cops arrive, and find Jonathan dead from a fall.
Cut to Jonathan's funeral. Ex-wife Jane (Sarah Strange), her husband, and her and Jon's kid (Nicholas Elia) start to leave, when the car radio freaks out, and Jon sends his own EVP message to his son: "I'm sorry, Mikey."
Oh, and Sarah (Deborah Kara Unger) doesn't die. Last we see of her, she's at the funeral too. She's in a wheelchair. Everybody leaves, and she's left alone in the cemetery (alone, in a wheelchair? how's she supposed to get home?), and the demon-shape-things seem to appear behind her.
That's it. That's the ending. And I am so glad I got to see White Noise for free, in a comp'd hotel room, so that 1) I didn't have to pay to watch this drek, and 2) neither do you. Skip it 'til it's on free-to-air TV.