Troubleshooting the system battery.............................................................................................................................182Troubleshooting power supply units.............................................................................................................................183Troubleshooting cooling problems................................................................................................................................ 183Troubleshooting cooling fans.........................................................................................................................................184Troubleshooting system memory..................................................................................................................................184Troubleshooting an internal USB key........................................................................................................................... 185Troubleshooting an SD card.......................................................................................................................................... 185Troubleshooting an optical drive................................................................................................................................... 186Troubleshooting a hard drive......................................................................................................................................... 187Troubleshooting a storage controller............................................................................................................................ 187Troubleshooting expansion cards..................................................................................................................................188Troubleshooting processors.......................................................................................................................................... 1898 Using system diagnostics........................................................................................................................... 190Dell Embedded System Diagnostics.............................................................................................................................190When to use the Embedded System Diagnostics................................................................................................ 190Running the Embedded System Diagnostics from Boot Manager.....................................................................190Running the Embedded System Diagnostics from the Dell Lifecycle Controller..............................................190System diagnostic controls...................................................................................................................................... 1919 Jumpers and connectors............................................................................................................................ 192System board jumper settings...................................................................................................................................... 192System board connectors..............................................................................................................................................193Disabling a forgotten password.................................................................................................................................... 19610 Getting help.............................................................................................................................................. 197Contacting Dell................................................................................................................................................................197Documentation feedback...............................................................................................................................................197Accessing system information by using QRL.............................................................................................................. 197Quick Resource Locator (QRL).............................................................................................................................. 198Contents 7