Dell Latitude 9420 Service Manual page 5

Updating the BIOS in Windows .....................................................................................................................................76
Updating BIOS on systems with BitLocker enabled............................................................................................ 77
Updating your system BIOS using a USB flash drive.......................................................................................... 77
System and setup password...........................................................................................................................................78
Assigning a system setup password....................................................................................................................... 78
Deleting or changing an existing system setup password................................................................................. 79
ExpressSign-in....................................................................................................................................................................79
Chapter 5: Troubleshooting.........................................................................................................83
Dell SupportAssist Pre-boot System Performance Check diagnostics................................................................83
Running the SupportAssist Pre-Boot System Performance Check................................................................83
System diagnostic lights..................................................................................................................................................83
Diagnostic error messages..............................................................................................................................................85
System error messages................................................................................................................................................... 88
Wi-Fi power cycle..............................................................................................................................................................88
Chapter 6: Getting help and contacting Dell................................................................................ 89
Contents 5