Dell PowerEdge R420 Owner's Manual page 10

Item Indicator, Button, or
Connector
6 LCD panel
7 USB connectors (2)
8 Information tag
9 Optical drive (optional)
10 Hard drives
Figure 2. Front-Panel Features and Indicators—Eight 2.5 Inch Hard-Drive System
Item Indicator, Button, or
Connector
1 Power-on indicator, power
button
2 NMI button
3 System identification button
10
Icon Description
Displays system ID, status information, and system error
messages. The LCD lights blue during normal system
operation. The LCD lights amber when the system needs
attention, and the LCD panel displays an error code
followed by descriptive text.
NOTE: If the system is connected to a power source
and an error is detected, the LCD lights amber
regardless of whether the system is turned on or off.
Allows you to connect USB devices to the system. The
ports are USB 2.0-compliant.
A slide-out label panel which allows you to record system
information such as Service Tag, NIC, MAC address, and
so on as per your need.
One optional slim SATA DVD-ROM drive or DVD+/-RW
drive.
Up to four 3.5 inch or 2.5 inch hot-swappable hard drives,
or SSDs.
Icon Description
The power-on indicator lights when the system power is
on. The power button controls the power supply output to
the system.
NOTE: On ACPI-compliant operating systems, turning
off the system using the power button causes the
system to perform a graceful shutdown before power
to the system is turned off.
Used to troubleshoot software and device driver errors
when running 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.
The identification buttons on the front and back panels
can be used to locate a particular system within a rack.