150 Troubleshooting Your SystemTroubleshooting External ConnectionsEnsure that all external cables are securely attached to the externalconnectors on your system before troubleshooting any external devices.See Figure 1-1 and Figure 1-4 for the front- and back-panel connectorson your system.Troubleshooting the Video Subsystem1 Check the system and power connections to the monitor.2 Check the video interface cabling from the system to the monitor.3 If two monitors are attached to the system, disconnect one monitor.The system supports only one monitor attached to either the front orrear video connector.4 If the problem persists, see "Getting Help" on page 181.Troubleshooting a USB Device1 Use the following steps to troubleshoot a USB keyboard and/or mouse.For other USB devices, go to step 2.a Disconnect the keyboard and mouse cables from the system brieflyand reconnect them.b Connect the keyboard/mouse to the USB port(s) on the opposite sideof the system.If the problem is resolved, restart the system, enter the System Setupprogram, and check if the nonfunctioning USB ports are enabled.c Replace the keyboard/mouse with another working keyboard/mouse.If the problem is resolved, replace the faulty keyboard/mouse.If the problem is not resolved, proceed to the next step to begintroubleshooting the other USB devices attached to the system.2 Power down all attached USB devices and disconnect them from the system.
