334 Troubleshooting• If the system does not power on, check the LED display. If the power LEDis not on, you may not be receiving AC power. Check the AC power cord tomake sure that it is securely connected.Troubleshooting System Startup FailureIf your system halts during startup, especially after installing an operatingsystem or reconfiguring your system’s hardware, check for invalid memoryconfigurations. These could cause the system to halt at startup without anyvideo output.For all other startup issues, note any system messages that appear onscreen.See "Using the System Setup Program" on page 59 for more information.Troubleshooting External ConnectionsEnsure that all external cables are securely attached to the externalconnectors on your system before troubleshooting any external devices. See"Front-Panel Features and Indicators" on page 16 for the front-panelconnectors on the sled.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.Troubleshooting a USB DeviceUse the following steps to troubleshoot a USB keyboard and/or mouse. Forother USB devices, go to step 5.1 Disconnect the keyboard and mouse cables from the sled briefly andreconnect them.2 Connect the keyboard/mouse to the USB port(s) on the front of the sled.3 If the problem is resolved, restart the system, enter the System Setupprogram, and check if the nonfunctioning USB ports are enabled.4 Replace the keyboard/mouse with another working keyboard/mouse.If the problem is resolved, replace the faulty keyboard/mouse.
