Dell PowerEdge SC1425 - Manual (Page 16)

Table 2-2. Diagnostic Indicator Codes
Hard-drive indicator The green hard-drive activity indicator flashes when the SATA hard drives are in use.
NOTE: It does not flash when SCSI hard drives are in use.
NMI button The NMI button is used to troubleshoot software and device driver errors when using certain operating systems. This button
can be pressed using the end of a paper clip. Use this button only if directed to do so by qualified support personnel or by
the operating system's documentation.
System
identification button The identification buttons on the front and back panels can be used to locate a particular system within a rack. When one of
these buttons is pushed, the blue system status indicator on the front and back blinks until one of the buttons is pushed
again.
USB connectors These connect USB 2.0-compliant devices to the system.
Power-on indicator,
Power button
The power-on indicator blinks when power is available to the system, but the system is not powered on.
The power button controls the DC power supply output to the system.
NOTICE: If you turn off the system using the power button and the system is running an ACPI-compliant operating system,
the system performs a graceful shutdown before the power is turned off. If the system is not running an ACPI-compliant
operating system, the power is turned off immediately after the power button is pressed.
Diagnostic
indicators (4) The diagnostic indicators aid in diagnosing and troubleshooting the system. For more information, see Table 2 -2 .
Code Causes Corrective Action
Possible processor failure. See "Troubleshooting the Processor" in "Troubleshooting Your System."
Memory failure. See "Troubleshooting System Memory" in "Troubleshooting Your System."
Possible expansion card failure. See "Troubleshooting Expansion Cards" in "Troubleshooting Your System."
Possible video card failure. See "Troubleshooting Expansion Cards" in "Troubleshooting Your System."
Diskette drive or hard drive failure. Ensure that the diskette drive and hard-drive are properly connected. See "Installing Drives"
for information on the drives installed in your system.
Possible USB failure. See "Troubleshooting a USB Device" in "Troubleshooting Your System."
No memory modules detected. See "Troubleshooting System Memory" in "Troubleshooting Your System."
System board failure. See "Getting Help."
Memory configuration error. See "Troubleshooting System Memory" in "Troubleshooting Your System."