Powering Pixhawk Issues

I am using Pixhawk as my flight controller. It not the original one.

My Pixhawk suddenly stopped booting. This is the second Pixhawk with which this problem has occurred :frowning:

Only the I/O lights glow (PWR, B/E & ACI). The FMU ones and booting light does not glow. The Pixhawk is not detected by the laptop.

I guess it’s because of problem of powering the Pixhawk. I am using a servo to power the servo rail since I am using a Lidar on the servo rail. I am using a power module to power the Pixhawk. I am also using a USB cable for data transmission using a laptop.

Is there any precaution or circuit to be made for using the Pixhawk in this manner.

Thanks in advance.