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
Turns on when you turn on the computer and blinks when the computer is in a power
management mode.
Turns on when the computer reads or writes data.
Turns on steadily or blinks to indicate battery charge status.
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.
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.
Blinking
Blinking
Solid
A possible graphics card/video failure has occurred.
Blinking
Blinking
Off
System failed on hard drive initialization OR System
failed in Option ROM initialization.
Blinking
Off
Blinking
The USB controller encountered a problem during
initialization.
Solid
Blinking
Blinking
No memory modules are installed/detected.
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