Dell OptiPlex 3090 Ultra Service Manual page 5

Chapter 6: Troubleshooting........................................................................................................137
Dell SupportAssist Pre-boot System Performance Check diagnostics.............................................................. 137
Running the SupportAssist Pre-Boot System Performance Check.............................................................. 137
Diagnostic LED................................................................................................................................................................. 138
Recovering the operating system................................................................................................................................138
Real-Time Clock (RTC Reset)...................................................................................................................................... 139
Backup media and recovery options........................................................................................................................... 139
WiFi power cycle..............................................................................................................................................................139
Chapter 7: Getting help and contacting Dell............................................................................... 140
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