If your system is not working as expected, begin troubleshooting using the procedures in this section. This section guides you through some initial checks and
procedures that can solve basic system problems and provides troubleshooting procedures for components inside the system. Before you start any of the
procedures in this section, take the following steps:

Get the key to the system keylock.

Remove the front bezel.

Lay the system on its left-side.

Read the "Safety Instructions" in your System Information document.

Read "

Running System Diagnostics

" for information about running diagnostics.

Safety First—For You and Your System

The procedures in this guide require that you remove the cover and work inside the system. While working inside the system, do not attempt to service the
system except as explained in this guide and elsewhere in your system documentation. Always follow the instructions closely. Review all of the procedures in
the safety instructions in your System Information document.

Observe the following precautions when working inside your system.

External Connections

Improperly set switches, controls, and loose or improperly connected cables are the most likely source of problems for the system, monitor, or other
peripherals (such as a printer, keyboard, mouse, or other external equipment). A quick check of all the switches, controls, and cable connections can easily
solve these problems. See

Figure 2

-3

for the back-panel features and connectors.

Checking Specific System Problems

Turn off the system, including any attached peripherals. Disconnect all the power cables from their electrical outlets.

If the system is connected to a PDU, turn the PDU off and then on again.

If it is not receiving power, plug it into another electrical outlet. If it still is not receiving power, try another PDU.

Reconnect the system to the electrical outlet or PDU.

WARNING:

The power supplies in this system produce high voltages and energy hazards, which can cause bodily harm. Only trained service

technicians are authorized to remove the system cover and access any of the components inside the system.

CAUTION:

See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document before performing

any procedure which requires you to open the cover.