User`s guide

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 Troubleshooting Your System
Dell™PowerEdge™850SystemsInstallationandTroubleshootingGuide
Safety First—For You and Your System
Start-Up Routine
Checking the Equipment
RespondingtoaSystemsManagementSoftwareAlertMessage
Inside the System
Opening the System
Closing the System
Troubleshooting a Wet System
Troubleshooting a Damaged System
Troubleshooting the System Battery
Troubleshooting the Power Supply
Troubleshooting System Cooling Problems
Troubleshooting System Memory
Troubleshooting an Optical Drive
Troubleshooting SCSI Hard Drives
Troubleshooting SATA Hard Drives
Troubleshooting a RAID Controller Card
Troubleshooting Expansion Cards
Troubleshooting the Microprocessor
Safety First—For You and Your System
To perform certain procedures in this document, you must remove the system 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.

Start-Up Routine
Look and listen during the system's start-up routine for the indications described in Table4-1.
Table 4-1. Start-UpRoutineIndications
Checking the Equipment
This section provides troubleshooting procedures for external devices attached to the system, such as the monitor, keyboard, or mouse. Before you perform
any of the procedures, see "Troubleshooting External Connections."

Troubleshooting IRQ Assignment Conflicts
Most PCI devices can share an IRQ with another device, but they cannot use an IRQ simultaneously. To avoid this type of conflict, see the documentation for
CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system.
Before performing any procedure, see your Product Information Guide for complete information about safety precautions, working inside the
computer and protecting against electrostatic discharge.

Look/listen for:

Action
An error message displayed on the monitor.
See "System Messages" in "Indicators, Messages, and Codes."
A series of beeps emitted by the system.
See "System Beep Codes" in "Indicators, Messages, and Codes."
Alert messages from the systems management software.
See the systems management software documentation.
The monitor's power indicator.
See "Troubleshooting the Video Subsystem."
The keyboard indicators.
See "Troubleshooting the Keyboard."
The USB diskette drive activity indicator.
See "Troubleshooting a USB Device."
The USB CD drive activity indicator.
See "Troubleshooting a USB Device."
The optical drive activity indicator.
See "Troubleshooting an Optical Drive."
The hard-drive activity indicator.
See "Troubleshooting SCSI Hard Drives."
An unfamiliar constant scraping or grinding sound when you access a drive.
See "Getting Help."