Dell Inspiron 15 3521 Service Manual page 5

Chapter 3: Drivers and downloads............................................................................................... 85
Chapter 4: BIOS setup.................................................................................................................86
BIOS overview................................................................................................................................................................... 86
Entering BIOS setup program........................................................................................................................................ 86
Navigation keys..................................................................................................................................................................86
One time boot menu......................................................................................................................................................... 87
System setup options....................................................................................................................................................... 87
Updating the BIOS.............................................................................................................................................................91
Updating the BIOS in Windows.................................................................................................................................91
Updating the BIOS using the USB drive in Windows.......................................................................................... 91
Updating the BIOS from the F12 One-Time boot menu.....................................................................................92
System and setup password...........................................................................................................................................92
Assigning a system setup password....................................................................................................................... 93
Deleting or changing an existing system setup password.................................................................................93
Clearing BIOS (System Setup) and System passwords.......................................................................................... 94
Chapter 5: Troubleshooting.........................................................................................................95
Handling swollen Lithium-ion batteries........................................................................................................................ 95
Dell SupportAssist Pre-boot System Performance Check diagnostics............................................................... 95
Running the SupportAssist Pre-Boot System Performance Check................................................................96
Built-in self-test (BIST)................................................................................................................................................... 96
M-BIST...........................................................................................................................................................................96
LCD Power rail test (L-BIST)................................................................................................................................... 97
LCD Built-in Self Test (BIST)................................................................................................................................... 97
System-diagnostic lights................................................................................................................................................. 97
Recovering the operating system................................................................................................................................. 98
Real-Time Clock (RTC Reset)........................................................................................................................................99
Backup media and recovery options.............................................................................................................................99
WiFi power cycle............................................................................................................................................................... 99
Drain residual flea power (perform hard reset)......................................................................................................... 99
Chapter 6: Getting help and contacting Dell............................................................................... 101
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