1-4 Dell PowerEdge 4100/180 and 4100/200 Systems User’s Guide• If an optional Dell PowerEdge Expandable RAIDController SCSI host adapter card is installed in thesystem, the amber drive fault indicator (identified bya triangular icon) blinks if a disk failure has beendetected.Figure 1-1. Front PanelConnecting External DevicesYou can connect various external devices, such as amouse and printer, to the I/O ports and connectors on thecomputer’s back panel. The system BIOS detects thepresence of external devices when you boot or rebootyour system. When connecting external devices to yourcomputer, follow these guidelines:• Check the documentation that accompanied thedevice for specific installation and configurationinstructions.For example, most devices must be connected to aparticular I/O port or connector to operate properly.Also, external devices like a mouse or printer usuallyrequire you to load software files called device driversinto memory before they will work. These softwaredrivers help the computer recognize an externaldevice and direct its operation.• Always attach external devices while your computeris turned off. Then turn on the computer beforeturning on any external devices, unless the documen-tation for the device specifies otherwise. (If thecomputer does not seem to recognize the device, tryturning on the device before the computer to see ifthis resolves the problem.)For information about enabling, disabling, or configuringI/O ports and connectors, see Chapter 4, “Using the Sys-tem Setup Program,” or Chapter 5, “Using the EISAConfiguration Utility.” For detailed descriptions andillustrations of each port and connector on the I/O panel,see “I/O Ports and Connectors” in Appendix B.Preventing Unauthorized AccessInside the ComputerTo prevent unauthorized access to the inside of the com-puter, you can lock the left and right computer covers andhard-disk drives using a key provided with the system.Figure 1-2. Keylockpowerindicatorpower buttonreset button diskette-driveaccess indicator(typical)SCSI hard-disk driveactivity indicatorSCSI hard-disk drivefault indicatorSCSI hard-disk driveonline indicator
