IBM x3550 Problem Determination And Service Manual page 138

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Type 7978 and 1913 server," on page 29 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Error code Description
I9990650 AC power has been restored.
120
IBM System x3550 Type 7978 and 1913: Problem Determination and Service Guide
Action
1. Check the power cables.
2. Check for interruption of the ac power supply.