Deleting or changing an existing system setup password............................................................................... 127
Clearing CMOS settings.................................................................................................................................................127
Clearing BIOS (System Setup) and System passwords......................................................................................... 127
Chapter 9: Troubleshooting....................................................................................................... 129
Dell SupportAssist Pre-boot System Performance Check diagnostics.............................................................. 129
Running the SupportAssist Pre-Boot System Performance Check.............................................................. 129
Power-Supply Unit Built-in Self-Test ........................................................................................................................ 129
System-diagnostic lights................................................................................................................................................130
Recovering the operating system................................................................................................................................130
Real Time Clock—RTC reset.........................................................................................................................................131
Backup media and recovery options............................................................................................................................ 131
Wi-Fi power cycle.............................................................................................................................................................131
Chapter 10: Getting help and contacting Dell............................................................................. 132
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