5 Troubleshooting......................................................................................................................... 76
Enhanced Pre-Boot System Assessment (ePSA) diagnostics......................................................................................76
Running the ePSA diagnostics..................................................................................................................................... 76
System diagnostic lights..................................................................................................................................................... 76
Diagnostics............................................................................................................................................................................77
M-BIST............................................................................................................................................................................78
LCD Built-in Self Test (BIST) ................................................................................................................................78
Recovering the operating system......................................................................................................................................78
Flashing BIOS (USB key)....................................................................................................................................................78
Flashing the BIOS................................................................................................................................................................ 79
WiFi power cycle..................................................................................................................................................................79
Flea power release...............................................................................................................................................................79
Enabling Intel Optane memory...........................................................................................................................................80
Disabling Intel Optane memory..........................................................................................................................................80
6 Getting help and contacting Dell.................................................................................................. 81
Contents 5
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