Diagnostics - Dell D27M Service Manual

Diagnostics

The following table provides the different LED states and what they indicate.
Table 2. LED states
Power LED state
Off
Solid Amber
Blinking Amber
Solid White
Blinking White
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 during the start-up. The system LED is integrated on the Power
button.
The following table shows different light patterns and what they indicate.
Description
• Hibernate or suspend to disk (S4)
• Power is pff (S5)
Boot failure: This is a system fault error
condition, including the power supply.
Only the +5VSB rail on the power supply
is working correctly.
Boot Failure: The computer is receiving
electrical power, and power supplied by
the power supply is normal. A device
might be malfunctioning or incorrectly
installed. Refer to the table below for
Amber Blinking Pattern diagnostics
suggestion and possible failures.
System is in S0 state, the normal power
state of a functioning machine.
System is in a low power state, either S1
or S3. This does not indicate a fault
condition.
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