Intel Desktop Board DX79TO 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
| Item/Callout | LED |
|
Activity | in Figure 7 | Color | Description |
|
|
|
|
Watch Dog Timer Fire/ | K | Red | When the watch dog timer fires to reset |
Back to BIOS |
|
| 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 | B | Green | This LED will flash when the hard drive |
Initialization |
|
| activity starts. Then the LED will stay on |
|
|
| when hard drive initialization is complete. |
|
|
|
|
Option ROM | D | Green | This LED will flash when the option ROM |
Initialization |
|
| 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. |
|
|
|
|
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