Troubleshooting Your System 161Troubleshooting Your SystemSafety First—For You and Your SystemCAUTION: Many repairs may only be done by a certified service technician. Youshould only perform troubleshooting and simple repairs as authorized in yourproduct documentation, or as directed by the online or telephone service andsupport team. Damage due to servicing that is not authorized by Dell is not coveredby your warranty. Read and follow the safety instructions that came with theproduct.Troubleshooting System Startup FailureIf your system halts during startup prior to video imaging or LCD messaging,especially after installing an operating system or reconfiguring your system’shardware, check for the following conditions:• If you boot the system to the BIOS boot mode after installing an operatingsystem from the UEFI Boot Manager, the system will hang. The reverse isalso true. You must boot to the same boot mode in which you installed theoperating system. See "Using the System Setup Program and UEFI BootManager" on page 59.• Invalid memory configurations could cause the system to halt at startupwithout any video output. See "System Memory" on page 100.For all other startup issues, note the LCD panel messages and any systemmessages that appear onscreen. For more information, see "LCD StatusMessages" on page 22 and "System Messages" on page 40.Troubleshooting External ConnectionsEnsure that all external cables are securely attached to the externalconnectors on your system before troubleshooting any external devices. SeeFigure 1-1 and Figure 1-3 for the front- and back-panel connectors on yoursystem.
