Pixhawk 2.4.8 Main LED Not Blinking and and Buzzer Tune

Hello There.
I am facing an issue with Pixhawk Flight Controller.
When i plugged with mission planner, Main LED didn’t show not even single blink and no buzzer sound.
Connect with Mission Planner with Auto-Port Selection but not able to configuration

Hey Muhammad!

How are you linking the FC to your PC? Via a telemetry module via USB, or direct link a micro-usb from FC to PC?