Diagnostic Lights
When you turn on your computer, it performs a series of
The following tables lists the codes for the diagnostic lights, gives probable causes, and suggests corrective actions. The lights are labeled to help you match the pattern on your computer with one shown in the tables:
•Diagnostic Light Codes Before POST
•Diagnostic Light Codes During POST
Preboot Diagnostic Codes
The following table lists the codes for the diagnostic lights that occur before the computer begins the POST.
D i a g n o s t i c L i g h t C o d e s B e f o r e P O S T
Light Pattern | Cause | Action |
|
|
|
| No electrical power is supplied to the | Connect the computer to its electrical outlet. Ensure that |
| computer. | the |
A B C D |
| ensure that the computer is connected to a working |
| electrical outlet and then press the power button. | |
|
| If the problem is still not resolved, contact Dell for |
|
| technical assistance. |