System Diagnostic Lights - Dell W12C Service Manual

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
1
2
3
4
5
6
7
8
3,3
(Three amber color LED flashes
followed by three white color LED
flashes.)
3,4
(Three amber color LED flashes
followed by four white color LED
flashes.)
88
Problem description
System board: BIOS and ROM failure
No memory or RAM detected
System board or chipset error
Memory or RAM failure
CMOS battery failure
Video card or chip failure
CPU failure
Display failure
BIOS recovery image not found
BIOS recovery image found but invalid