Handling swollen Lithium-ion batteries.............................................................................................................................77
Locate the Service Tag or Express Service Code of your Dell computer ................................................................... 77
System-diagnostic lights.....................................................................................................................................................77
SupportAssist diagnostics...................................................................................................................................................78
Built-in self-test (BIST).......................................................................................................................................................79
Recovering the operating system......................................................................................................................................80
WiFi power cycle............................................................................................................................................................... 80
Drain residual flea power (perform hard reset)................................................................................................................80
Backup media and recovery options..................................................................................................................................81
5