Dell R 420 Manual

ItemIndicator, Button, or 
ConnectorIconDescriptionWhen one of these buttons is pressed, the LCD panel on 
the front and the system status indicator on the back  flashes until one of the buttons is pressed again.
Press to toggle the system ID on and off.
If the system stops responding during POST, press and 
hold the system ID button for more than five seconds to 
enter BIOS progress mode.
To reset iDRAC (if not disabled in F2 iDRAC setup) press 
and hold the button for more than 15 seconds.
4USB...

ItemIndicator, Button, or 
ConnectorIconDescriptionNOTE: 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.2NMI buttonUsed 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...

Figure 4. LCD Panel Features
ItemButtonDescription1LeftMoves the cursor back in one-step 
increments.2SelectSelects the menu item highlighted by 
the cursor.3RightMoves the cursor forward in one-step 
increments.
During message scrolling:
•Press once to increase scrolling 
speed
•Press again to stop
•Press again to return to default  scrolling speed
•Press again to repeat the cycle
Home Screen
The Home screen displays user-configurable information about the system. This screen is displayed during normal...

OptionDescriptionSelect Simple to display LCD error messages in a simplified user-friendly description. See 
System Error Messages for a list of messages in this format.Set homeSelect the default information to be displayed on the LCD Home screen. See View Menu to see 
the options and option items that can be set as the default on the Home screen.
View Menu
NOTE: When you select an option in the View menu, you must confirm the option before proceeding to the next 
action.
OptionDescriptioniDRAC...

Hard-drive indicatorConditionCorrective ActionThe indicator lights 
green to indicate 
hard-drive activity..None required.Electrical indicatorConditionCorrective ActionThe indicator blinks 
amber if the system 
experiences an 
electrical error (for 
example, voltage out 
of range, or a failed 
power supply or 
voltage regulator).See the System Event Log or system messages for the specific issue. 
If it is due to a problem with the power supply, check the LED on the 
power supply. Re-seat the power supply...

PCIe indicatorConditionCorrective ActionThe indicator blinks 
amber if a PCIe card 
experiences an 
error.Restart the system. Update any required drivers for the PCIe card. 
Re-install the card. If the problem persists, see 
Getting Help.
Hard-Drive Indicator Patterns
Figure 5. Hard-Drive Indicators
1.hard-drive activity indicator (green)
2.hard-drive status indicator (green and amber)
NOTE: If the hard drive is in Advanced Host Controller Interface (AHCI) mode, the status indicator (on the right side)...

Drive-Status 
Indicator Pattern 
(RAID Only)ConditionBlinks green three 
seconds, amber three 
seconds, and off six 
secondsRebuild aborted
Back-Panel Features And Indicators
Figure 6. Back-Panel Features and Indicators
ItemIndicator, Button, or 
ConnectorIconDescription1PCIe expansion card slot 1Allows you to connect one low-profile PCI Express 
expansion card.2vFlash card slotAllows you to connect the vFlash card.3iDRAC port (optional)Dedicated management port on the iDRAC Ports card.4Serial...

ItemIndicator, Button, or 
ConnectorIconDescriptionTo reset the iDRAC (if not disabled in F2 iDRAC setup) 
press and hold the button for more than 15 seconds.11Power supply (PSU1)350 W and 550 W
NOTE: For non-redundant power supply units, there is 
only one power supply socket.
12Power supply (PSU2)
NIC Indicator Codes
Figure 7. NIC Indicator
1.link indicator
2.activity indicator
IndicatorIndicator CodeLink and activity 
indicators are offThe NIC is not connected to the network.Link indicator is...

Figure 8. Power Supply Status Indicator
1.power supply status indicator/handle
Power Indicator 
PatternConditionNot litPower is not connected.GreenThe handle indicator lights green indicating that a valid power source is connected to the  power supply and that the power supply is operational.Flashing amberIndicates a problem with the power supply.
CAUTION: When correcting a power supply mismatch, replace only the power supply with 
the flashing indicator. Swapping the opposite power supply to make a...

•Any media that ships with your system that provides documentation and tools for configuring and managing your system, including those pertaining to the operating system, system management software, system updates, and 
system components that you purchased with your system.
•For the full name of an abbreviation or acronym used in this document, see the Glossary at www.dell.com/support/
manuals.
NOTE: Always check for updates on www.dell.com/support/manuals and read the updates first because they often...