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<F12>
changes boot sequence (during start-up only)
<Ctrl><Alt><F10>
launches the utility partition (if installed) during
computer start-up
<Ctrl><Enter>
disables computer password at start-up (after correct
password is entered)
Controls and Lights
Power control
push button
Power light
green light; blinking green in sleep state; dual-color
for computer operations —green for power, yellow for
diagnostics
Hard-drive access light
green
Link integrity light (on integrated network connector)
green light for 10-Mb operation; orange light for 100-
Mb operation; yellow light for 1,000-Mb (1-Gb)
operation
Activity light (on integrated network connector)
yellow blinking light
Diagnostic lights
four lights located on the front panel
Power
DC power supply:
Wattage
Dell Precision 650 computer: 460 W
Dell Precision 450 computer: 360 W
Heat dissipation
Dell Precision 650 computer: 1000 BTU/hr
Dell Precision 450 computer: 910 BTU/hr
Voltage
90 to 135 V at 50/60 Hz; 180 to 265 V at 50/60 Hz
Backup battery
3-V CR2032 lithium coin cell
Physical
Dell Precision 650 computer
Height
49.1 cm (19.3 inches)
Width
22.2 cm (8.7 inches)
Depth
48.8 cm (19.2 inches)
Weight
19 kg (42 lbs)
Dell Precision 450 computer
Height
16.5–16.8 cm (6.5–6.6 inches)
Width
44.7 cm (17.6 inches)
Depth
44.5 cm (17.5 inches)
Weight
18.6 kg (41 lbs)
Supported monitor weight (in desktop
orientation)
45.4 kg (100 lbs)
Environmental
Temperature:
Operating
10°to35°C(50°to95°F)
NOTE: At35°C(95°F),themaximumoperating
altitude is 914 m (3000 ft).
Storage
–40°to65°C(–40°to149°F)
Relative humidity
20% to 80% (noncondensing)
Maximum vibration:
Operating
0.25 G at 3 to 200 Hz at 0.5 octave/min
Storage
0.5 G at 3 to 200 Hz at 1 octave/min
Maximum shock:
Operating
bottom half-sine pulse with a change in velocity of
50.8 cm/sec (20 inches/sec)
Storage
Dell Precision 650 comptuer:
nonoperating (half-sine pulse) 105 G, 2 ms
nonoperating (faired-square wave) 27 G with
a velocity change of 508 cm/sec (200