Server controls, LEDs, and powerThis section describes the controls and light-emitting diodes (LEDs) and how toturn the server on and off. For the locations of other LEDs on the system board,see “System-board LEDs” on page 31.Front viewThe following illustration shows the controls, LEDs, and connectors on the front ofthe server.v Rack release latches: Press the latch on each front side of the server to slide theserver out of the rack.v Electrostatic-discharge connector: Connect an electrostatic-discharge wrist strapto this connector when you work with static-sensitive devices.v Drive status LEDs: These LEDs are on SAS or SATA hard disk drives and solidstate drives. When one of these LEDs is lit, it indicates that the drive has failed.When this LED is flashing slowly (one flash per second), it indicates that thedrive is being rebuilt. When the LED is flashing rapidly (three flashes persecond), it indicates that the controller is identifying the drive.v Drive activity LEDs: These LEDs are on SAS or SATA hard disk drives and solidstate drives. Each hot-swap drive has an activity LED, and when this LED isflashing, it indicates that the drive is in use.v CD/DVD eject button: Press this button to release a DVD or CD from theCD/DVD drive.v CD/DVD drive activity LED: When this LED is lit, it indicates that theCD-RW/DVD drive is in use.v Operator information panel: This panel contains controls and LEDs that provideinformation about the status of the server. For information about the controlsand LEDs on the operator information panel, see “Operator information panel”on page 17.v Operator information panel release button: Press the blue release button andpull out the light path diagnostics panel to view the light path diagnostics LEDsand buttons. See “Light path diagnostics” on page 18, “Light path diagnostics”on page 156, and “Light path diagnostics LEDs” on page 159 for moreinformation about light path diagnostics.16 System x3750 M4 Types 8722 and 8733: Installation and Service Guide
