Dell Precision 490 - Manual (Page 94)

Key Combinations
<F2> starts embedded system setup (during start-up only)
<F12> or <Ctrl><Alt><F8> starts the Boot Device menu (during start-up only)
<Ctrl><Alt><F10> launches the utility partition (if installed) during start-
up
Controls and Lights
Power control push button
Power light green light—blinking green in sleep state; solid green
for power-on state
amber light—blinking amber indicates that an internal
power problem might exist; solid amber indicates that
a device may be malfunctioning or incorrectly installed
(see
Power Problems )
Hard-drive access light green light - on when the computer reads data from
or writes data to the hard drive. The light may also
be on when a device such as the CD/DVD drive is
operating.
Link integrity lights Back panel: green light for 10-Mb operation; orange
light for 100-Mb operation; yellow light for a 1000-Mb
(1-Gb) operation
Front panel: displays solid green when a network
connection is present
NOTE: If you disable the onboard LAN controller in
System Setup, these lights will remain off, even if an
active network connection is present.
Activity light yellow blinking light on the back panel when there is
network activity
NOTE: If you disable the onboard LAN controller in
System Setup, this light will remain off, even if an
active network connection is present.
Diagnostic lights four lights on the front panel (see Diagnostic Lights )
Standby power light AUX_PWR on the system board
Power
DC power supply:
Wattage 750 W
Heat dissipation 2559 BTU/Hour
NOTE: Heat dissipation is calculated based upon the
power supply wattage rating.
Voltage auto-sensing power supply—90 V to 265 V at 50/60
Hz
Backup battery 3-V CR2032 lithium coin cell
Physical
Height 44.8 cm (17.6 inches)
Width 17.1 cm (6.8 inches)
Depth 46.7 cm (18.4 inches)
Weight 17.7 kg (39 lb)
Supported monitor weight (in desktop
orientation) 45.4 kg (100 lb)
Environmental
Temperature: