Dell XPS 14 9440 Owner's Manual page 5

Updating the BIOS............................................................................................................................................................ 99
Updating the BIOS in Windows................................................................................................................................99
Updating the BIOS using the USB drive in Windows........................................................................................100
Updating the BIOS from the F12 One Time Boot menu................................................................................... 100
System and setup password..........................................................................................................................................101
Assigning a System Setup password..................................................................................................................... 101
Deleting or changing an existing system setup password............................................................................... 102
Clearing BIOS (System Setup) and System passwords.........................................................................................102
Chapter 8: Troubleshooting....................................................................................................... 103
Handling swollen rechargeable Li-ion batteries........................................................................................................103
Locate the Service Tag or Express Service Code of your Dell computer ........................................................ 103
Dell SupportAssist Pre-boot System Performance Check diagnostics.............................................................. 104
Running the SupportAssist Pre-Boot System Performance Check.............................................................. 104
Built-in self-test (BIST)..................................................................................................................................................104
M-BIST......................................................................................................................................................................... 104
LCD Power rail test (L-BIST)................................................................................................................................. 105
LCD Built-in Self-Test (BIST).................................................................................................................................105
Diagnostic error codes................................................................................................................................................... 106
Recovering the operating system................................................................................................................................106
Real-Time Clock (RTC Reset)...................................................................................................................................... 106
Backup media and recovery options........................................................................................................................... 106
Wi-Fi power cycle............................................................................................................................................................106
Drain residual flea power (perform hard reset)........................................................................................................107
Chapter 9: Getting help and contacting Dell...............................................................................108
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