2-2 Dell WorkStation 400 Systems Service ManualE xternal Visual InspectionThe external visual inspection consists of a quick inspection of the exterior ofthe computer, the monitor, the keyboard, any peripherals, and cables. While per-forming the visual inspection, make any necessary corrections. To perform theexternal visual inspection, follow these steps:1. Turn off the computer, the monitor, and all peripherals.2. Verify that all power cables are properly connected to the computer, themonitor and peripherals, and their power sources.3. Verify that the keyboard and mouse interface cables are firmlyattached to the proper connectors on the back of the computer.For a PS/2-compatible mouse, the keyboard and mouse interface cable con-nectors are identical except for their labels. If needed, see “SystemFeatures” in Chapter 1.For a serial mouse, the mouse interface cable must be firmly attached to oneof the serial port connectors, and its captive screws must be secure enoughto ensure a firm connection.4. Verify that any devices connected to the serial ports, parallel port, andUSB connectors are properly attached.Each of the serial, parallel, and USB interface cables must be firmlyattached to an appropriate connector on the back of the computer as well asto the interface connector on the device. The captive screws that securethese connectors at each end of the interface cable must be secure enough toensure a firm connection.5. Verify that the video interface cable is firmly attached to the connectoron the video expansion card and to the connector on the back of themonitor.For proper monitor connections, see the documentation for the monitor.6. Inspect all external monitor controls for any obvious damage orimproper settings.For proper settings of the monitor controls, see the documentation for themonitor.7. Inspect the keyboard to ensure that no keys are sticking.If one or more keys are sticking, it may be necessary to replace thekeyboard.
