Why are you feeding Pinkies?
Pinkies whether from rats or mice are too small for BP, the average hatchling starts on rat crawlers or hopper mice and quickly move to the next size up.
Now as far as not eating here are some questions for you
What is the size of your BP?
What is the size of your enclosure?
What are your temps and humidity and what type of thermometer, hygrometer are you using? (dial or digital?) Where do you measure your temps?
What type of hides are you providing? Are they tight with all sides touching your BP's body?
How often have you handled your BP if any?
What prey type was fed by the prior owner or breeder?