Diagnostic Light Codes Before POST
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. |
|
|
|
| Normal off condition. Computer is | Ensure that the |
| connected to its electrical outlet. | light is off, ensure that the computer is connected to a |
A B C D |
| working electrical outlet, and then press the power button. |
| When the computer is operating normally, it can be | |
|
| automatically or remotely started as long as it remains |
|
| connected to an electrical outlet. For more information, see |
|
| "Power Management" in the User’s Guide. |
|
| If the problem is still not resolved, contact Dell for |
|
| technical assistance. |
|
|
|
| Computer is in a reduced power or | Use one of the appropriate methods to "wake up" the |
| "sleep" state. | computer. See "Power Management" in the User’s Guide. |
A B C D |
| If the problem is still not resolved, contact Dell for |
| technical assistance. | |
|
|
|
| BIOS is not executing. | See "Reset Corrupted BIOS Settings" in the User’s Guide. |
A B C D |
|
|
|
|
|
| Possible power supply or power cord | See "Power Problems" in the User’s Guide. |
| failure. |
|
A B C D |
|
|
|
|
|
| Possible system board failure. | Contact Dell for technical assistance. |
A B C D
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Setup and Quick Reference Guide
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