Troubleshooting system startup failure............................................................................................. 93Troubleshooting external connections..............................................................................................93Troubleshooting the video subsystem...............................................................................................93Troubleshooting a USB device........................................................................................................... 94Troubleshooting a serial I/O device................................................................................................... 94Troubleshooting a NIC....................................................................................................................... 95Troubleshooting a wet system........................................................................................................... 95Troubleshooting a damaged system..................................................................................................96Troubleshooting the system battery.................................................................................................. 97Troubleshooting power supply units..................................................................................................97Troubleshooting power source problems................................................................................... 97Power supply unit problems......................................................................................................... 97Troubleshooting cooling problems................................................................................................... 98Troubleshooting cooling fans............................................................................................................ 99Troubleshooting system memory...................................................................................................... 99Troubleshooting an internal USB key.............................................................................................. 100Troubleshooting an SD card............................................................................................................. 101Troubleshooting an optical drive......................................................................................................101Troubleshooting a hard drive........................................................................................................... 102Troubleshooting a storage controller.............................................................................................. 102Troubleshooting expansion cards....................................................................................................103Troubleshooting processors............................................................................................................ 104System messages.............................................................................................................................. 104Warning messages...................................................................................................................... 104Diagnostic messages...................................................................................................................105Alert messages.............................................................................................................................1056 Using system diagnostics................................................................................106Dell Embedded System Diagnostics................................................................................................ 106When to use the Embedded System Diagnostics......................................................................106Running the Embedded System Diagnostics from Boot Manager........................................... 106Running the Embedded System Diagnostics from the Dell Lifecycle Controller.................... 106System diagnostics controls....................................................................................................... 1077 Jumpers and connectors................................................................................ 108System board jumpers and connectors...........................................................................................108System board jumper settings.......................................................................................................... 110Disabling a forgotten password........................................................................................................ 1108 Technical specifications.................................................................................. 112Dimensions and weight.....................................................................................................................112Processor specifications....................................................................................................................1126