User Manual

1. Shutdown the computer.
2. Press and hold the <fn> key, while pressing the power button, and then release both.
The Enhanced Pre-boot System Assessment window displays, listing all devices detected in the
computer. The diagnostics starts running the tests on all the detected devices.
3. On the boot menu screen, select the Diagnostics option.
The Enhanced Pre-boot System Assessment window displays, listing all devices detected in the
computer. The diagnostics starts running the tests on all the detected devices.
4. If you wish to run a diagnostic test on a specific device, press <Esc> and click Yes to stop the
diagnostic test.
5. Select the device from the left pane and click Run Tests
6. If there are any issues, error codes are displayed.
Note the error code and contact Dell.
Device status lights
Table 29. Device Status Lights
Icon Name Description
Power
status
light
Turns on when you turn on the computer and blinks when the computer is in a
power management mode.
Hard
drive
status
light
Turns on when the computer reads or writes data.
Battery
charge
indicator
Turns on steadily or blinks to indicate battery charge status.
WiFi
indicator
Turns on when wireless networking is enabled.
The device status LEDs are usually located either on the top or left side of the keyboard. They display the
storage, battery and wireless devices connectivity and activity. Apart from that they can be useful as a
diagnostic tool when there's a possible failure to the system.
NOTE: The position of the power status light may vary depending on the system.
The following table lists how to read the LED codes when possible errors occur.
Table 30. LED Lights
Storage LED Power LED Wireless LED Fault Description
Blinking Solid Solid A possible processor failure has occurred.
Solid Blinking Solid The memory modules are detected but encountered
an error.
Blinking Blinking Blinking A system board failure has occurred.
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