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Intel Desktop Board DX79TO 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
thei
r 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.