Locate the Service Tag or Express Service Code of your Dell computer ........................................................ 126
Dell SupportAssist Pre-boot System Performance Check diagnostics.............................................................. 127
Running the SupportAssist Pre-Boot System Performance Check.............................................................. 127
Built-in self-test (BIST)..................................................................................................................................................127
M-BIST......................................................................................................................................................................... 127
LCD Power rail test (L-BIST)..................................................................................................................................128
LCD Built-in Self-Test (BIST)................................................................................................................................. 128
System-diagnostic lights................................................................................................................................................129
Recovering the operating system................................................................................................................................129
Recovering the operating system................................................................................................................................130
Real-Time Clock (RTC Reset)...................................................................................................................................... 130
Backup media and recovery options........................................................................................................................... 130
Wi-Fi power cycle............................................................................................................................................................130
Drain residual flea power (perform hard reset)........................................................................................................130
Chapter 10: Getting help and contacting Dell............................................................................. 132
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