Dell Precision 3520 Owner's Manual page 7

System and setup password.......................................................................................................................................... 95
Assigning a system setup password....................................................................................................................... 95
Deleting or changing an existing system setup password.................................................................................96
Clearing CMOS settings.................................................................................................................................................. 96
Clearing BIOS (System Setup) and System passwords.......................................................................................... 96
Chapter 7: Troubleshooting......................................................................................................... 97
Handling swollen Lithium-ion batteries........................................................................................................................ 97
Built-in self-test (BIST)................................................................................................................................................... 98
M-BIST...........................................................................................................................................................................98
LCD Power rail test (L-BIST)................................................................................................................................... 98
LCD Built-in Self Test (BIST)................................................................................................................................... 98
Real Time Clock reset...................................................................................................................................................... 99
Recovering the operating system................................................................................................................................. 99
Backup media and recovery options........................................................................................................................... 100
WiFi power cycle..............................................................................................................................................................100
Drain residual flea power (perform hard reset)....................................................................................................... 100
Chapter 8: Diagnostics............................................................................................................... 101
Enhanced Pre-Boot System Assessment ePSA diagnostics................................................................................. 101
Device status lights.........................................................................................................................................................102
LAN status LED................................................................................................................................................................103
Battery status lights........................................................................................................................................................103
Chapter 9: Contacting Dell.........................................................................................................104
Contents 7