Fixing A No-Boot Issue Caused By Usb-Boot Support; Enhanced Pre-Boot System Assessment (Epsa) Diagnostics - Dell XPS 13 Service Manual

8 The BIOS Update Utility appears. Follow the instructions on the screen to
complete the BIOS update.
Fixing a no-boot issue caused by USB-boot
support
Sometimes the computer does not boot to the operating system when USB devices
are connected to the computer during startup. This behavior occurs because the
computer is looking for bootable files in connected USB devices.
Either disconnect USB devices before booting or follow these steps to fix the no-boot
issue.
1 Turn on or restart your computer.
2 Press F2 when the Dell logo is displayed on the screen to enter the BIOS setup
program.
The BIOS setup program is displayed.
3 On the left pane, select Settings → System Configuration → USB
Configuration.
The USB configuration is displayed on the right pane.
4 Clear the Enable Boot Support check box to disable it.
5 Save the settings and exit.
Enhanced Pre-Boot System Assessment
(ePSA) diagnostics
CAUTION: Use the ePSA diagnostics to test only your computer. Using this
program with other computers may cause invalid results or error messages.
The ePSA diagnostics (also known as system diagnostics) performs a complete check
of your hardware. The ePSA is embedded with the BIOS and is launched by the BIOS
internally. The embedded system diagnostics provides a set of options for particular
devices or device groups allowing you to:
• Run tests automatically or in an interactive mode
• Repeat tests
• Display or save test results
• Run thorough tests to introduce additional test options to provide extra
information about the failed device(s)
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