Dell PRECISION WORKSTATION 450 manual Controls and Lights, Power, Physical, Environmental

<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	45.4 kg (100 lbs)
orientation)
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