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 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
2,1
System board failure
2,2
No memory/RAM detected, system board, PSU
2,3
System board, memory or processor failure
3,6
Recovery image not found
3,7
Recovery image found but invalid
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