Dell R220 owner manual See Getting Help

Item	Indicator, Button, or	Icon	Description
	Connector
5	Hard-drive indicator		The indicator blinks green to indicate hard-drive
			activity.
6	Electrical indicator		The indicator blinks amber if the system
			experiences an electrical error (for example,
			voltage out of range, or a failed power supply or
			voltage regulator).

See the System Event Log or system messages for the specific issue. Re-seat the power supply by removing and reinstalling it. If the problem persists, see Getting Help.

7 Temperature indicator

8 System status indicator

The indicator blinks amber if the system experiences a thermal error (for example, a temperature out of range or fan failure).

Ensure that none of the following conditions exist:

•A cooling fan is removed or has failed.

•System cover, cooling shroud, EMI filler panel, memory-module blank, or back-filler bracket is removed.

•Ambient temperature is too high.

•External airflow is obstructed.

See Getting Help.

Lights blue during normal system operation.

Lights amber when the system needs attention due to a problem.

•See the System Event Log or system messages for the specific issue.

•Invalid memory configurations can cause the system to halt at startup without any video output. See Getting Help.

9	System identification	The identification buttons on the front and back
	button	panels can be used to locate a particular system
		within a rack. When one of these buttons is
		pressed, the system status indicator on the front
		and the back of the system flashes until one of the
		buttons is pressed again.
		Press to toggle the system ID on and off.

If the system stops responding during POST, press and hold the system ID button for more than five seconds to enter BIOS progress mode.

To reset iDRAC (if not disabled in the iDRAC Settings option) press and hold the button for more than 15 seconds.

8