Daisy chained Power supply: -12v rail dead?

Merry Xmas to all,

I need help: on the pictures you can see my daisy chained power supplies. On the main board the -12v led is off (modules doesn’t function properly). The colors of the connected power cables are misleading, the black cable has a red and Blue end (- to -). But Everything is connected like it says in the manual. I use the GST120A20-P1M Power Supply and this is my power consumption: Power Consumption: 1347 mA +12V | 634 mA -12V | 0 mA 5V

  1. why is the -12v rail on the main power bus dead?
  2. why is the -12v rail on the daisy chained bus active?

Best regards,