5 The screen displays multiple color bars and the entire screen changes to red, green and blue. During this process, carefully inspect the
screen for any abnormalities.
6 Press Esc to exit.
NOTE: LCD BIST is also initiated when Enhanced Pre-Boot System Assessment (ePSA) diagnostics is launched. For
more information about ePSA, see Dell EPSA Diagnostic 3.0.
Recovering the operating system
When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell SupportAssist OS
Recovery.
Dell SupportAssist OS Recovery is a standalone tool that is preinstalled in all Dell computers installed with Windows 10 operating system. It
consists of tools to diagnose and troubleshoot issues that may occur before your computer boots to the operating system. It enables you to
diagnose hardware issues, repair your computer, back up your les, or restore your computer to its factory state.
You can also download it from the Dell Support site to troubleshoot and x your computer when it fails to boot into their primary operating
system due to software or hardware failures.
For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at www.dell.com/
support.
Flashing BIOS (USB key)
1 Follow the procedure from step 1 to step 7 in "Flashing the BIOS" to download the latest BIOS setup program le.
2 Create a bootable USB drive. For more information see the knowledge base article SLN143196 at www.dell.com/support.
3 Copy the BIOS setup program le to the bootable USB drive.
4 Connect the bootable USB drive to the computer that needs the BIOS update.
5 Restart the computer and press F12 when the Dell logo is displayed on the screen.
6 Boot to the USB drive from the One Time Boot Menu.
7 Type the BIOS setup program lename and press Enter.
8 The BIOS Update Utility appears. Follow the instructions on the screen to complete the BIOS update.
Flashing the BIOS
About this task
You may need to ash (update) the BIOS when an update is available or when you replace the system board.
Follow these steps to ash the BIOS:
Steps
1 Turn on your computer.
2 Go to www.dell.com/support.
3 Click Product support, enter the Service Tag of your computer, and then click Submit.
NOTE
: If you do not have the Service Tag, use the auto-detect feature or manually browse for your computer model.
4 Click Drivers & downloads > Find it myself.
5 Select the operating system installed on your computer.
6 Scroll down the page and expand BIOS.
7 Click Download to download the latest version of the BIOS for your computer.
8 After the download is complete, navigate to the folder where you saved the BIOS update le.
9 Double-click the BIOS update le icon and follow the instructions on the screen.
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