LED-R (RAM)
This LED turns Green, the moment the memory initialization is successful.
This LED is Yellow while the memory initialization is in progress.
If the memory initialization has failed, for example: There is no DIMM installed / the DIMM is not supported - the R LED will stay Yellow.
The R-LED should stay Green at normal operation, also after BIOS POST is o
LED-B (BIOS)
This LED is Yellow after display initialization.
If BIOS setup menu is needed, the DEL button is functional from the moment the B-LED is Yellow.
The B-LED is Green when the OS takes charge of the system.
H - HDMI
This LED is Green only when the HDMI port of the internal graphics is connected to a monitor.
D - Display Port
This LED is Green only when one or both of the Display Ports of the internal graphics are connected to a monitor.