support.dell.com Basic Troubleshooting 4-35. Reseat the video-interface cable connectors (blue) to the video connector on the(blue) to the video connector on theback of the computer and to the connector on the back of the monitor.NOTE: On some monitors, the video interface cable is permanently attached.6. If the system has a network card, verify the network connections as instructed in“Network” found later in this chapter.7. Turn on the computer, the monitor, and all attached devices.PowerIf you are experiencing problems with power to your computer, perform the followingtasks:• Check the computer’s and monitor’s power indicators. When litWhen lit or flashing, thepower indicator verifies that the power supply is operating. Whenever the poweris on, the fan on the power supply should also spin. If the fan does not spin, referto “System Board” in Chapter 6 for further troubleshooting information.• Plug a device such as a lamp that you know works into the electrical outlet toknow works into the electrical outlet tomake sure the power source is OK.• Plug the computer directly into that known good electrical outlet, bypassing anypower protection devices, power strips, and extension cables to verify that thesystem turns on.• Turn off the computer and any attached devices, and disconnect them from theirelectrical outlets. Disconnect any devices attached to the computer except forthe mouse and the monitor. Reseat the power cable at the back of the computer;then reconnect the computer and monitor to an electrical outlet, making sure thatall connections fit tightly together. Turn on the computer system. If the computerboots (starts)(starts), turn it off again and reconnect devices one at a time, turning on thesystem each time to see if the problem returns.• Turn off the system, and swap the monitor and computer power cables.Start-Up RoutineNOTE: Most of the checks in Table 4-1 require observation of computer functions andks in Table 4-1 require observation of computer functions andindications, some of which can occur simultaneously. It may be necessary to restartthe computer several times to complete all these checks.Table 4-1. Start-Up Routine IndicationsIndication ActionA message is displayed on the monitor. Refer to Table C-2.You hear a series of beeps. Refer to Appendix C.The diagnostic indicators on the back ofthe computer are not all green.Refer to Table C-1.
