Drobo

Drobo 5D3 frozen on startup - How to safely restart?

My 5D3 is about 4 months old. Upon startup it froze with the lights in this position:

  • 3 capacity lights (1,5,9) solid blue
  • the drive lights all off
  • The bottom right activity light solid green
  • Bottom left power light is yellow

How do I safely restart? Thank you!