Jill H. O’Bones
Play around with the characters, make them do something that wasn't planned. (I did once make the M.C. kill her lover once.) Leave the computer on, but go and do something else, dishes, clean the stalls, mow the lawn, etc. If something like that doesn't work, I'll stop writing for a few days, and not think about the story. That makes the characters mad and they start speaking, very loudly!