Oracle Sun Server X4-4, Service Manual

Page: 51 / 292

Troubleshoot Hardware Faults
Troubleshooting and Diagnostics 51
Hardware Component Failure
Components, such as power supplies and fan modules, are an integral part of the server cooling
system. When one of these components fails, the server internal temperature can rise. This rise
in temperature can cause other components to enter into an over temperature state. Additionally,
some components, such as processors, might overheat when they are failing, which can also
generate an over-temperature event.
Action : Investigate the cause of the over-temperature event, and replace failed components
immediately . For hardware troubleshooting information, see “Troubleshooting Server Hardware
Faults” on page 34 .
Prevention : Component redundancy is provided to a allow for component failure in critical
subsystems, such as the cooling subsystem. However, once a component in a redundant
system fails, the redundancy no longer exists, and the risk for server shutdown and component
failures increases. Therefore, it is important to maintain redundant systems and replace failed
components immediately .
Troubleshooting Power Issues
If your server does not power on, the cause of the problem might be one of the following:
■
“AC Power Connection” on page 52
■
“Power Supplies (PSUs)” on page 53
■
“Top Cover” on page 54