System Board Connectors

Processor

one 1155-pin connector

Processor Fan

one 5-pin connector

Service mode jumper

one 2-pin connector

Password clear jumper

one 2-pin connector

RTC reset jumper

one 2-pin connector

Internal speaker

one 5-pin connector

Intruder connector

one 3-pin connector

Power connector

 

Mini-Tower, Desktop,

one 24-pin and one 4-pin connector

Small Form Factor

 

Ultra Small Form Factor

one 8-pin, one 6-pin, and one 4-pin

 

connector

Controls and Lights

 

 

 

Front of the 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,

99

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Image 99
Dell 990 service manual Controls and Lights