IBM 9228 - IntelliStation Z - Pro Service Manual page 25

DC power LED
On some computer models, each power supply has a dc power LED and
an ac power LED. During typical operation, both the ac and dc power LEDs
are lit.
AC power LED
On some computer models, each power supply has an ac power LED and
a dc power LED. During typical operation, both the ac and dc power LEDs
are lit.
Power-cord connector
Connect the power cord to this connector.
7
Chapter 1. Introduction