Controls

ID	Identification (ID) button Lights up (blue) on the front and on the rear of the HNC when the ID button is pressed. The two ID indicators are synchronized.
	On/Off button When the HNC is switched off, it is switched on again by pressing the On/Off button once. When the HNC in is in operation, it is switched off by pressing the On/Off button once. CAUTION! Possible loss of data! The On/Off switch does not disconnect the server from the voltage grid. To disconnect from the mains completely, remove the power plugs.
RESET	Reset button Pressing the Reset button reboots the HNC. CAUTION! Possible loss of data!
NMI	NMI button
	CAUTION! Do not press! Possible loss of data! The NMI button may only be used by Customer Support.

Indicators on the operating panel

	Power-on indicator (white, green) Lights up white when the HNC is switched off but line voltage is present. For HNC M3 the power indicator stays dark in this case but the status indicator light up green instead. Blinks white and green alternatingly during power up delay. If the HNC is switched off and then immediately switched on again, it is only restarted after a power up delay. This prevents a current overload, for example. Lights up green when the HNC is switched on. Flashes green when the HNC has been switched on and is in standby mode or in sleep mode.
	Hard disk activity indicator (green) Flashes green when an internal hard disk drive is being accessed.
CSS	CSS and Global error indicators (yellow/orange)
	Generally, the states of these indicators have the following meanings: Do not light up when the HNC is OK. If the event is still acute after a power failure, the indicator is activated after the restart. Light up when a prefailure event was detected. The indicator also lights up in standby mode. Flash when an error was detected. The indicator also flashes in standby mode. Irrespective of the color, when an indicator lights up or flashes this indicates an error event. Please notify customer support.
ID	ID indicator (blue) Lights up blue when the HNC has been selected by pressing the ID button. To deactivate, press the button again.

Optical drive activity indicator

Lights up green when the storage medium is accessed. See also figure 35 resp. 38.

Hard disk drive resp. SSD control indicators

Figure 39: Front - Detailed view: Indicators on a hard disk module resp. an SSD at HNC M4 / HNC M5 / HNC M6

No.	Meaning
1	HDD/SSD BUSY (green) Lights up: HDD/SSD in active phase Does not light up: HDD/SSD inactive
2	HDD/SSD FAULT (orange) (in conjunction with a RAID controller) Does not light up: no HDD/SSD error Lights up: HDD/SSD Faulty or Rebuild Stopped (drive defective, needs replacing, a rebuild process was stopped or the HDD module/SSD is not correctly inserted) Slow flashing: HDD/SSD Rebuild (the data is being restored after changing a hard disk drive) Fast flashing: HDD/SSD Identify Four fast flashes/pause: HDD/SSD Predicted Fault Two fast flashes/pause: HDD/SSD Hot Spare (The corresponding drive has failed).