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.
Table 1. DiagnosticsThe following table provides the different light
patterns and what they indicate.
Number of amber LED flashes
Problem description
2, 1
System board failure
2, 2
System board, PSU or PSU cabling failure
2, 3
System board, RAM or CPU failure
2, 4
CMOS battery failure
2, 5
Corrupt BIOS. Recovery image not detected or is invalid during BIOS auto-recovery process.
2, 6
CPU configuration error or CPU failure
2, 7
RAM failure
3, 1
PCIe (e.g. GPU) card failure
3, 2
Storage/USB configuration error or failure
3, 3
No RAM detected
3, 4
System board error
3, 5
Memory configuration error, incompatible memory or invalid memory configuration
3, 6
Recovery image not detected
3, 7
Recovery image detected but invalid
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