what triggers a black hole apart from a supernova from a dying star

Question: what triggers a black hole apart from a supernova from a dying star
- Keywords:
  black hole,
  star,
  supernova,
  trigger
Asked by anonnmutt (ginger) to Deborah, Euan, Maheen, Rob, Stu on 18 Jun 2016. This question was also asked by The Van-Der-Webbers.
- Euan Allen answered on 18 Jun 2016:
  
  There are two types of black holes: stellar black holes, which are formed from dying stars, and also primordial black holes. Primordial black holes are not from dying stars but we think they were formed in the very early parts of the universe just after the big bang.

Question: what triggers a black hole apart from a supernova from a dying star