Intel DX79SI Product Guide for Intel Desktop Board DX79SI - Page 28

System Initialization LEDs - video

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Intel Desktop Board DX79SI Product Guide System Initialization LEDs At initial power on, these eight diagnostic LEDs are off. When the BIOS starts an activity such as memory initialization, the corresponding LED starts flashing. Once the activity has completed, the LED will remain on. Table 4 lists the LEDs and describes their function. Table 4. System Initialization LEDs Activity Watch Dog Timer Fire/ Back to BIOS Item/Callout in Figure 7 K LED Color Red Processor Initialization G Memory Initialization F Video Initialization E USB Initialization C Mass Storage B Initialization Option ROM D Initialization OS Start A Green Green Green Green Green Green Green Description When the watch dog timer fires to reset the board, this LED will flash. In addition, this LED will light and stay on when the Back to BIOS button has been pressed. This LED will flash when the processor initialization activity starts. Then the LED will stay on when processor initialization is complete. This LED will flash when the memory initialization activity starts. Then the LED will stay on when memory initialization is complete. This LED will flash when the video initialization activity starts. Then the LED will stay on when video initialization is complete. This LED will flash when the USB initialization activity starts. Then the LED will stay on when USB initialization is complete. This LED will flash when the hard drive activity starts. Then the LED will stay on when hard drive initialization is complete. This LED will flash when the option ROM activity starts. Then the LED will stay on when option ROM initialization is complete. Just before BIOS transfers control to the operating system, this LED will light and stay on. 28

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Intel Desktop Board DX79SI Product Guide
28
System Initialization LEDs
At initial power on, these eight diagnostic LEDs are off.
When the BIOS starts an
activity such as memory initialization, the corresponding LED starts flashing.
Once the
activity has completed, the LED will remain on.
Table 4 lists the LEDs and describes
their function.
Table 4. System Initialization LEDs
Activity
Item/Callout
in Figure 7
LED
Color
Description
Watch Dog Timer Fire/
Back to BIOS
K
Red
When the watch dog timer fires to reset
the board, this LED will flash.
In addition, this LED will light and stay on
when the Back to BIOS button has been
pressed.
Processor Initialization
G
Green
This LED will flash when the processor
initialization activity starts.
Then the LED
will stay on when processor initialization is
complete.
Memory Initialization
F
Green
This LED will flash when the memory
initialization activity starts.
Then the LED
will stay on when memory initialization is
complete.
Video Initialization
E
Green
This LED will flash when the video
initialization activity starts.
Then the LED
will stay on when video initialization is
complete.
USB Initialization
C
Green
This LED will flash when the USB
initialization activity starts.
Then the LED
will stay on when USB initialization is
complete.
Mass Storage
Initialization
B
Green
This LED will flash when the hard drive
activity starts.
Then the LED will stay on
when hard drive initialization is complete.
Option ROM
Initialization
D
Green
This LED will flash when the option ROM
activity starts.
Then the LED will stay on
when option ROM initialization is complete.
OS Start
A
Green
Just before BIOS transfers control to the
operating system, this LED will light and
stay on.