Dell W12C - System Diagnostic Lights

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.
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
8 Display failure
3,3
(Three amber color LED flashes
followed by three white color LED
flashes.)
BIOS recovery image not found
3,4
(Three amber color LED flashes
followed by four white color LED
flashes.)
BIOS recovery image found but invalid
88