Dell XPS 15 9575 2-in-1 XPS 15 2-in-1 Service Manual - Page 65

Fixing a no-boot issue caused by USB-boot support

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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 filename and press Enter. 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. NOTE: The F2 prompt indicates that the keyboard is initialized. This prompt can appear very quickly, so you must watch for it, and then press F2. If you press F2 before the F2 prompt, this keystroke is lost. If you wait too long and the operating system logo appears, continue to wait until you see the desktop. Then, turn off your computer and try again. 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 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) • View status messages that inform you if tests are completed successfully • View error messages that inform you of problems encountered during testing NOTE: Some tests for specific devices require user interaction. Always ensure that you are present at the computer terminal when the diagnostic tests are performed. For more information, see Dell EPSA Diagnostic 3.0. Running the ePSA diagnostics 1. Turn on your computer. 2. As the computer boots, press the F12 key as the Dell logo appears. 3. On the boot menu screen, select the Diagnostics option. 4. Click the arrow at the bottom left corner. Diagnostics front page is displayed. 5. Click the arrow in the lower-right corner to go to the page listing. The items detected are listed. 6. To run a diagnostic test on a specific device, press Esc and click Yes to stop the diagnostic test. 7. Select the device from the left pane and click Run Tests. Troubleshooting 65

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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 filename and press
Enter
.
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.
NOTE:
The F2 prompt indicates that the keyboard is initialized. This prompt can appear very quickly, so you must
watch for it, and then press F2. If you press F2 before the F2 prompt, this keystroke is lost. If you wait too long and
the operating system logo appears, continue to wait until you see the desktop. Then, turn off your computer and try
again.
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
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)
•
View status messages that inform you if tests are completed successfully
•
View error messages that inform you of problems encountered during testing
NOTE:
Some tests for specific devices require user interaction. Always ensure that you are present at the computer
terminal when the diagnostic tests are performed.
For more information, see
Dell EPSA Diagnostic 3.0
.
Running the ePSA diagnostics
1.
Turn on your computer.
2.
As the computer boots, press the F12 key as the Dell logo appears.
3.
On the boot menu screen, select the
Diagnostics
option.
4.
Click the arrow at the bottom left corner.
Diagnostics front page is displayed.
5.
Click the arrow in the lower-right corner to go to the page listing.
The items detected are listed.
6.
To run a diagnostic test on a specific device, press Esc and click
Yes
to stop the diagnostic test.
7.
Select the device from the left pane and click
Run Tests
.
Troubleshooting
65