Service Manual

Running the ePSA diagnostics
1 Power-on the 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 key at the bottom left corner.
Diagnostics front page is displayed.
5 Press 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 specic device, press Esc and click Yes to stop the diagnostic test.
7 Select the device from the left pane and click Run Tests.
8 If there are any issues, error codes are displayed.
Note the error code and validation number and contact Dell.
System diagnostic lights
The computer POST (Power On Self Test) ensures that it meets the basic computer requirements and the hardware is working
appropriately before the boot process begins. If the computer passes the POST, the computer continues to start in a normal
mode. However, if the computer fails the POST, the computer emits a series of LED codes in amber color during the start-up.
The following table shows dierent light patterns and what they indicate.
Table 9. Diagnostics
Number of Power LED ashes Problem description
1 System board: BIOS and ROM failure
2 No memory or RAM detected
3 System board or chipset error
4 Memory or RAM failure
5 CMOS battery failure
6 Video card or chip failure
7 CPU failure
3,6 BIOS recovery image not found
3,7 BIOS recovery image found but invalid
Flea power release
Flea power is the residual static electricity that remains on the computer even after it has been powered o. The following
procedure list the steps to conduct a ea power release for the computer.
1 Turn o your computer.
2 Disconnect the power cable.
3 Press and hold down the power button for 15 seconds to drain the ea power.
4 Connect the power cable.
5 Turn on your computer.
Wi-Fi power cycle
If your computer is unable to access the internet due to Wi-Fi connectivity issues a Wi-Fi power cycle procedure may be
performed. The following procedure provides the instructions on how to conduct a Wi-Fi power cycle:
110