Intel DX58SO2 Specification page 35

1.13.2.9 Status LED Indicators
The status LEDs display various status indicators as defined below. Figure 7 shows the
location of the LED indicators.
• The +5 V standby power indicator LED shows that power is still present even when
the computer appears to be off.
• The hard drive activity LED indicates activity of hard drives connected to the IOH
and any external discrete controllers on the board.
• The CPU Hot and VR Hot LEDs are controlled by external circuitry.
• The Watch Dog Fire/Back to BIOS LED indicates when the watch dog timer fires to
reset the board. The BIOS will program this LED to flash as early as possible in the
post. If the Back to BIOS button has been pressed, the BIOS will program this LED
to be constantly on.
• The six initialization LEDs will flash when initialization activity starts and stay on
when initialization is complete.
• The operating system LED changes to "constant on" just before the BIOS hands off
control to the operating system (int 19).
CAUTION
If AC power has been switched off and the standby power indicator is still lit,
disconnect the power cord before installing or removing any devices connected to the
board. Failure to do so could damage the board and any attached devices.
Product Description
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