Motherboard Power Connector
  +------+------+------+
  |Orange| Red  |Brown |   Power Good is a
TTL output from the power supply,
  | +12V | -12V |PwrGd |   a logical high indicating
a stable power supply.
  |------+------+------|
  |Yellow| Blue | Blue |
  | +5V  |Ground|Ground|
  +------+------+------+
Disk Drive Power Connectors
  Large Connector
    __________
   /         
\
  | O  O  O  O |   Connector viewed
from front (open end).
  +---+--------+   The two center pins are grounds.
+12V +5V
Small Connector
   |       |
   +-------+       Connector
viewed from front (open end).
   |o o o o|       The
two center pins are grounds.
    -----+-
  +12V   +5V