Dell Precision 450 Guide De Configuration Et De Référence Rapide page 36

Light Pattern Problem Description
No electrical power is supplied to
the computer.
A B C D
The computer is in a normal off
condition; the computer is
connected to its electrical outlet.
A B C D
The computer is in a reduced
power or "sleep" state.
A B C D
The BIOS is not executing.
A B C D
A possible power supply or power
cable failure has occurred.
A B C D
= y e l l o w
= g r e e n
= o f f
36
Setup and Quick Re ference Guide
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
Suggested Resolution
Connect the computer to its electrical outlet. Ensure
that the front-panel power light is on. If the power light
is off, 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.
Press the power button to turn the computer on.
If the computer does not turn on, ensure that the front-
panel power light is on. If the power light is off, 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.
Use one of the appropriate methods to "wake up" the
computer. See "Advanced Features" in your User's
Guide.
If the problem is not resolved and you are trying to wake
the computer with a USB mouse or keyboard, substitute
the mouse or keyboard with a working PS/2 mouse or
keyboard and try to wake the computer.
If the problem is still not resolved, contact Dell for
technical assistance.
Ensure that the microprocessor is seated correctly and
restart the computer.
If the problem is still not resolved, contact Dell for
technical assistance.
Perform the procedure in "Power Problems" in the
User's Guide.
If the problem is still not resolved, contact Dell for
technical assistance.