Disabling a forgotten password.....................................................................................................................................102
9 Troubleshooting your system......................................................................................................................103
Safety rst — for you and your system......................................................................................................................103
Troubleshooting system startup failure........................................................................................................................103
Troubleshooting external connections......................................................................................................................... 104
Troubleshooting the video subsystem......................................................................................................................... 104
Troubleshooting a USB device......................................................................................................................................104
Troubleshooting a serial I/O device..............................................................................................................................105
Troubleshooting a NIC................................................................................................................................................... 105
Troubleshooting a wet system......................................................................................................................................105
Troubleshooting a damaged system.............................................................................................................................106
Troubleshooting the system battery.............................................................................................................................107
Troubleshooting power supply units............................................................................................................................. 107
Troubleshooting power source problems............................................................................................................... 107
Power supply unit problems.................................................................................................................................... 107
Troubleshooting cooling problems................................................................................................................................ 108
Troubleshooting cooling fans.........................................................................................................................................108
Troubleshooting system memory..................................................................................................................................109
Troubleshooting an internal USB key........................................................................................................................... 109
Troubleshooting an SD card...........................................................................................................................................110
Troubleshooting an optical drive....................................................................................................................................110
Troubleshooting a tape backup unit...............................................................................................................................111
Troubleshooting a hard drive...........................................................................................................................................111
Troubleshooting expansion cards.................................................................................................................................. 112
Troubleshooting processors........................................................................................................................................... 113
10 Getting help...............................................................................................................................................114
Contacting Dell................................................................................................................................................................ 114
Documentation feedback............................................................................................................................................... 114
Accessing system information by using QRL...............................................................................................................114
Quick resource locator..............................................................................................................................................115
6
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