Dell NOT22422 Owner's Manual page 7

Assigning a System Setup password.................................................................................................................... 134
Deleting or changing an existing system setup password............................................................................... 134
Clearing BIOS (System Setup) and System passwords.........................................................................................135
Clearing Chassis Intrusion Alerts................................................................................................................................. 135
Chapter 9: Troubleshooting....................................................................................................... 138
Handling swollen rechargeable Li-ion batteries........................................................................................................138
Locate the Service Tag or Express Service Code of your Dell computer ............................................ 138
Dell SupportAssist Pre-boot System Performance Check diagnostics.............................................................. 139
Running the SupportAssist Pre-Boot System Performance Check.............................................................. 139
Built-in self-test (BIST)..................................................................................................................................................139
M-BIST......................................................................................................................................................................... 139
LCD Power rail test (L-BIST)................................................................................................................................. 140
LCD Built-in Self Test (BIST)................................................................................................................................. 140
System diagnostic lights................................................................................................................................................. 141
Recovering the operating system................................................................................................................................142
Backup media and recovery options........................................................................................................................... 142
Wi-Fi power cycle............................................................................................................................................................ 142
Drain residual flea power (perform hard reset)........................................................................................................142
Chapter 10: Getting help and contacting Dell............................................................................. 144
6 Contents