Asus DSAN-DX - Manual (Page 22)

2-2 Chapter 2: Hardware information
2. CPU Warning LED
The red CPU warning LED lights up as a reminder if CPU is not installed or
not properly installed in the CPU socket 2.
• When installing only one CPU, the CPU has to be installed to CPU2 socket
for a better thermal environment.
• If the CPU warning LED lights up, the motherboard will not boot.
DSAN-D
X
®
DSAN-DX CPU warning LED
CPU_WARN1
ON
CPU2 not present
(red)
CPU2 present
OFF