Dell OptiPlex 990 User Manual - Page 10

Service Manual, Mini Tower - two, Desktop - one, Small Form Factor - one

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Drives 2.5 inch SATA drive bays • Mini Tower - two • Desktop - one • Small Form Factor - one • Ultra Small Form Factor - one Control Lights And Diagnostic Lights Front of computer Power button light Blue light - Solid blue light indicates power-on state; blinking blue light indicates sleep state of the computer. Amber light - Solid amber light when the computer does not start indicates a problem with the system board or power supply. Blinking amber light indicates a problem with the system board. Drive activity light Blue light - Blinking blue light indicates that the computer is reading data from or writing data to the hard drive. Diagnostic lights Four lights located on the front panel of the computer. For more information on the diagnostic lights, see the Service Manual at support.dell.com/ manuals. Back of computer Power supply light Green light - The power supply is turned on and is functional. The power cable must be connected to the power connector (at the back of the computer) and the electrical outlet. NOTE: You can test the health of the power system by pressing the test button. When the system power supply voltage is within specification, the self-test LED lights up. If the LED does not light up, the power supply may be defective. AC power must be connected during this test. 10

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Drives
2.5 inch SATA drive bays
•
Mini Tower — two
•
Desktop — one
•
Small Form Factor — one
•
Ultra Small Form Factor — one
Control Lights And Diagnostic Lights
Front of computer
Power button light
Blue light — Solid blue light indicates power-on
state; blinking blue light indicates sleep state of the
computer.
Amber light — Solid amber light when the computer
does not start indicates a problem with the system
board or power supply. Blinking amber light indicates
a problem with the system board.
Drive activity light
Blue light — Blinking blue light indicates that the
computer is reading data from or writing data to the
hard drive.
Diagnostic lights
Four lights located on the front panel of the
computer. For more information on the diagnostic
lights, see the
Service Manual
at
support.dell.com/
manuals
.
Back of computer
Power supply light
Green light — The power supply is turned on and is
functional. The power cable must be connected to
the power connector (at the back of the computer)
and the electrical outlet.
NOTE:
You can test the health of the power
system by pressing the test button. When the
system
power supply voltage is within
specification, the self-test LED lights up. If the
LED does not light up, the power supply may be
defective. AC power must be connected during
this test.
10