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 in amber color during the start-up.
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 Power LED flashes
Problem description
1
System board: BIOS and ROM failure
2
No memory or RAM detected
3
System board or chipset error
4
Memory or RAM failure
5
CMOS battery failure
6
Video card or chip failure
7
CPU failure
3,6
BIOS recovery image not found
3,7
BIOS recovery image found but invalid
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