v Optional DVD drive activity LED: When this LED is lit, it indicates that theoptional DVD drive is in use.v Hot-swap hard disk drive activity LEDs (some models): This LED is used onSAS or SATA hard disk drives. Each hot-swap hard disk drive has an activityLED, and when this LED is flashing, it indicates that the drive is in use.v Hot-swap hard disk drive status LEDs (some models): This LED is used onSAS or SATA hard disk drives. When this LED is lit, it indicates that the drive hasfailed. If an optional IBM ServeRAID controller is installed in the server, when thisLED is flashing slowly (one flash per second), it indicates that the drive is beingrebuilt. When the LED is flashing rapidly (three flashes per second), it indicatesthat the controller is identifying the drive.Rear viewThe following illustration shows the LEDs and connectors on the rear of the server.Note: The illustrations in this document might differ slightly from your hardware.Power-cordconnectorUSB 1-2 connectorUSB 3-4 connectorSerialconnectorVideoconnectorEthernet 1activity LEDEthernet 1link LEDEthernet 2activity LEDEthernet 2link LEDNMI buttonPCI slot 1 PCI slot 2AC Power LED(green)DC Power LED(green) Power supplyerror LED(amber)v Ethernet link LEDs: When these LEDs are lit, they indicate that there is anactive link connection on the 10BASE-T, 100BASE-TX, or 1000BASE-TXinterface for the Ethernet port.v Ethernet activity LEDs: When these LEDs are lit, they indicate that there isactivity between the server and the network.v AC power LED (some models): This LED is used on power supply with ActiveEnergy Manager (AEM). This green LED provides status information about thepower supply. During typical operation, both the ac and dc power LEDs are lit.For any other combination of LEDs, see the Problem Determination and ServiceGuide on the IBM System x Documentation CD.v DC power LED (some models): This LED is use on power supply with AEM.This green LED provides status information about the power supply. Duringtypical operation, both the ac and dc power LEDs are lit. For any othercombination of LEDs, see the Problem Determination and Service Guide on theIBM System x Documentation CD.v Power-error (!) LED (some models): This LED is use on power supply withAEM. When this amber LED is lit, it indicates that the power supply has failed.For any other combination of LEDs, see the Problem Determination and ServiceGuide on the IBM System x Documentation CD.v Power cord connector: Connect the power cord to this connector.v Video connector: Connect a monitor to this connector.Chapter 1. The System x3250 M3 server 15