System diagnostic lights
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 13. Diagnostics
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
163
