Dell Latitude 3420 Service Manual page 6

Built-in self-test (BIST).................................................................................................................................................. 114
M-BIST.......................................................................................................................................................................... 114
LCD Power rail test (L-BIST).................................................................................................................................. 115
LCD Built-in Self Test (BIST).................................................................................................................................. 115
System-diagnostic lights................................................................................................................................................ 115
Recovering the operating system.................................................................................................................................117
Real-Time Clock (RTC Reset)....................................................................................................................................... 117
Backup media and recovery options............................................................................................................................ 117
WiFi power cycle...............................................................................................................................................................118
Drain residual flea power (perform hard reset)........................................................................................................ 118
Chapter 6: Getting help and contacting Dell............................................................................... 119
6 Contents