Gigabyte B760 DS3H User Manual - Page 20

Status LEDs, normally; if the BOOT LED is on, that means you haven't entered the operating system yet.

Page 20 highlights

Status LEDs The status LEDs show whether the CPU, memory, graphics card, and operating system are working properly after system power-on. If the CPU/DRAM/VGA LED is on, that means the corresponding device is not working normally; if the BOOT LED is on, that means you haven't entered the operating system yet. CPU: CPU status LED DRAM: Memory status LED VGA: Graphics card status LED BOOT: Operating system status LED CPU DRAM VGA BOOT - 20 -

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CPU:
CPU status LED
DRAM:
Memory status LED
VGA:
Graphics card status LED
BOOT:
Operating system status LED
CPU
DRAM
VGA
BOOT
Status LEDs
The status LEDs show whether the CPU, memory, graphics card, and operating system are working properly
after system power-on. If the CPU/DRAM/VGA LED is on, that means the corresponding device is not working
normally; if the BOOT LED is on, that means you haven't entered the operating system yet.